Networking Basics Final Exam Answers
1. Which statement describes the use of powerline networking technology?
- A device connects to an existing home LAN using an adapter and an existing electrical outlet.*
- New “smart” electrical cabling is used to extend an existing home LAN.
- Wireless access points use powerline adapters to distribute data through the home LAN.
- A home LAN is installed without the use of physical cabling.
2. Which wireless RF band do IEEE 802.11b/g devices use?
Explanation: Powerline networking adds the ability to connect a device to the network using an adapter wherever there is an electrical outlet. The network uses existing electrical wiring to send data. It is not a replacement for physical cabling, but it can add functionality in places where wireless access points cannot be used or cannot reach devices.
- 60 GHz
- 2.4 GHz*
- 900 MHz
- 5 GHz
3. Refer to the exhibit. Which term correctly identifies the device type that is included in the area B?
Explanation: 900 MHz is an FCC wireless technology that was used before development of the 802.11 standards. 900 MHz devices have a larger coverage range than the higher frequencies have and do not require line of sight between devices. 802.11b/g/n/ad devices all operate at 2.4 GHz. 802.11a/n/ac/ad devices operate at 5 GHz, and 802.11ad devices operate at 60 GHz.
Networking Basics Final Exam Answers q3
4. What is a disadvantage of deploying a peer-to-peer network model?
Explanation: Routers and switches are intermediary devices. End devices consist of PCs, laptops, and servers. They also include printers, VoIP phones, security cameras, and hand-held devices.
- lack of centralized administration*
- high cost
- difficulty of setup
- high degree of complexity
5. Which three steps must be completed to manually connect an Android or IOS device to a secured wireless network? (Choose three.)
Explanation: The simplest peer-to-peer network consists of two computers that are directly connected to each other through the use of a wired or wireless connection. The primary disadvantages of a peer-to-peer network are its lack of central administration, minimal security, and its lack of scalability.
- Change the MAC address.
- Set the IP address.
- Enter the network SSID.*
- Activate the Bluetooth antenna.
- Input the authentication password.*
- Choose the correct security type.*
6. A company is contemplating whether to use a client/server or a peer-to-peer network. What are three characteristics of a peer-to-peer network? (Choose three.)
Explanation: In order to connect an Android or IOS device to a Wi-Fi network manually, perform these steps:
Enter the network SSID of the wireless network.
Choose the security type used by the wireless network.
Input the password to authenticate successfully.
- better security
- easy to create*
- better device performance when acting as both client and server
- less cost to implement*
- lacks centralized administration*
7. Which type of device provides an Internet connection through the use of a phone jack?
Explanation: Because network devices and dedicated servers are not required, peer-to-peer networks are easy to create, less complex, and have lower costs. Peer-to-peer networks also have no centralized administration. They are less secure, not scalable, and those devices acting as both client and server may perform slower.
- satellite modem
- Wi-Fi AP
- DSL modem*
- cable modem
8. A traveling sales representative uses a cell phone to interact with the home office and customers, track samples, make sales calls, log mileage, and upload/download data while at a hotel. Which internet connectivity method would be a preferred method to use on the mobile device due to the low cost?
Explanation: SL technology uses the existing telephone network. For that reason, a DSL modem commonly has an RJ-11 phone
9. A user is configuring a wireless access point and wants to prevent any neighbors from discovering the network. What action does the user need to take?
Explanation: Mobile devices typically use either the cellular network or a Wi-Fi network to connect to the internet. The Wi-Fi connection is preferred because it uses less battery power and is free in many places.
- Configure DMZ settings.
- Disable SSID broadcast.*
- Configure a DNS server.
- Enable WPA encryption.
10. A tourist is traveling through the countryside and needs to connect to the internet from a laptop. However, the laptop only has Wi-Fi and Ethernet connections. The tourist has a smartphone with 3G/4G connectivity. What can the tourist do to allow the laptop to connect to the internet?
Explanation: Disabling SSID broadcast prevents the access point from announcing the name of the network. Enabling WPA encryption, configuring DMZ settings, and configuring a DNS server will accomplish different tasks, but the name of the network will still be announced.
- Enable tethering and create a hotspot.*
- Use the smartphone to access web pages and then pass the web pages to the laptop.
- Use the smartphone to access the internet through a satellite connection and then share that connection with the laptop.
- Use an Ethernet cable to connect the smartphone to the laptop.
11. What layer is responsible for routing messages through an internetwork in the TCP/IP model?
Explanation: Many cell phones have the ability to connect to other devices through a feature called tethering. The connection can be made using Wi-Fi, Bluetooth, or a USB cable. Once a device is connected, it is able to use the cellular connection of the phone to access the internet. When a cellular phone allows Wi-Fi devices to connect and use the mobile data network, this is called a hotspot.
- network access
12. What will a Cisco LAN switch do if it receives an incoming frame and the destination MAC address is not listed in the MAC address table?
Explanation: The TCP/IP model consists of four layers: application, transport, internet, and network access. Of these four layers, it is the internet layer that is responsible for routing messages. The session layer is not part of the TCP/IP model but is rather part of the OSI model.
- Send the frame to the default gateway address.
- Drop the frame.
- Forward the frame out all ports except the port where the frame is received.*
- Use ARP to resolve the port that is related to the frame.
13. What process involves placing one message format inside of another message format?
Explanation: A LAN switch populates the MAC address table based on source MAC addresses. When a switch receives an incoming frame with a destination MAC address that is not listed in the MAC address table, the switch forwards the frame out all ports except for the ingress port of the frame. When the destination device responds, the switch adds the source MAC address and the port on which it was received to the MAC address table.
- flow control
14. A cable installation company is trying to convince a customer to use fiber-optic cabling instead of copper cables for a particular job. What is one advantage of using fiber-optic cabling compared to copper cabling?
Explanation: When a message is placed inside of another message, this is known as encapsulation. On networks, encapsulation takes place when one protocol data unit is carried inside of the data field of the next lower protocol data unit.
- The installation skills required for fiber-optic cabling are lower.
- Fiber-optic cabling can transmit signals without attenuation.
- Fiber-optic cabling is completely immune to EMI and RFI.*
- The cost of fiber-optic connectors is lower.
15. What data encoding technology is used in copper cables?
Explanation: When comparing UTP cabling with fiber-optic cabling, note the following: fiber-optic connectors have higher costs, technician installation skills required are higher, fiber bandwidth supported is higher, and fiber-optic cabling is immune to RFI and EMI, and can transmit signals with less attenuation.
- electrical pulses*
- modulation of specific frequencies of electromagnetic waves
- modulation of light rays
- pulses of light
16. What information is added to the switch table from incoming frames?
Explanation: Data is transmitted across a network on media. Modern networks primarily use three types of media to interconnect devices:
- Metal wires within cables (copper cable, such as twisted-pair and coaxial cable) – Data is encoded into electrical impulses.
- Glass or plastic fibers within cables (fiber-optic cable) – Data is encoded into pulses of light.
- Wireless transmission – Data is encoded via modulation of specific frequencies of electromagnetic waves.
- destination IP address and incoming port number
- source MAC address and incoming port number*
- source IP address and incoming port number
- destination MAC address and incoming port number
17. At which layer of the OSI model would a logical address be added during encapsulation?
Explanation: A switch “learns” or builds the MAC address table based on the source MAC address as a frame comes into the switch. A switch forwards the frame onward based on the destination MAC address.
- network layer*
- physical layer
- transport layer
- data link layer
18. Which type of network model describes the functions that must be completed at a particular layer, but does not specify exactly how each protocol should work?
Explanation: Logical addresses, also known as IP addresses, are added at the network layer. Physical addresses are edded at the data link layer. Port addresses are added at the transport layer. No addresses are added at the physical layer.
- reference model*
- hierarchical design model
- protocol model
- TCP/IP model
19. Which two criteria are used to help select a network medium for a network? (Choose two.)
Explanation: There are two common types of network communication models:
Protocol model – This model closely matches the structure of a particular protocol suite and describes the functions that occur at each layer of protocols within the suite. The TCP/IP model is an example of a protocol model.
Reference model – The primary purpose is to aid in a clearer understanding of the functions and processes necessary for network communications.This type of model does not specify exactly how a function should be accomplished. The OSI model is an example of a reference model.
- the environment where the selected medium is to be installed*
- the cost of the end devices that are used in the network
- the number of intermediate devices that are installed in the network
- the distance the selected medium can successfully carry a signal*
- the types of data that need to be prioritized
20. Which scenario is suitable for deploying twisted-pair cables?
Explanation: Criteria for choosing a network medium include the following:
The distance the selected medium can successfully carry a signal in the environment in which the selected medium is to be installed
The amount of data and the speed at which the data must be transmitted
The cost of the medium and its installation
- to connect network devices in backbone networks
- to connect a TV set to the wall plug at home
- to connect data centers with high bandwidth requirements over long distances
- to connect PC workstations in an office*
21. Refer to the exhibit. How many bits are represented by each group of four hexadecimal values contained between the colons in an IPv6 address?
Explanation: Ethernet technology generally uses twisted-pair cables to interconnect devices. Because Ethernet is the foundation for most local networks, twisted-pair is the most commonly used type of network cabling for connecting office computers.
Networking Basics Final Exam Answers q21
22. Which network design has the fewest broadcast domains?
Explanation: The four hexadecimal values contained in a hextet represent 16 bits. There are eight hextets in an IPv6 address that make up the total 128 bits of the address. (16 x 8 = 128).
Networking Basics Final Exam Answers q22
23. A company uses DHCP servers to dynamically assign IPv4 addresses to employee workstations. The address lease duration is set as 5 days. An employee returns to the office after an absence of one week. When the employee boots the workstation, it sends a message to obtain an IP address. Which Layer 2 and Layer 3 destination addresses will the message contain?
Explanation: Routers break networks into separate broadcast domains. Each LAN is a broadcast domain. The correct answer has only one broadcast domain. All other answers have two broadcast domains.
- FF-FF-FF-FF-FF-FF and 255.255.255.255*
- MAC address of the DHCP server and 255.255.255.255
- FF-FF-FF-FF-FF-FF and IPv4 address of the DHCP server
- both MAC and IPv4 addresses of the DHCP server
24. What are two characteristics of multicast transmission? (Choose two.)
Explanation: When the lease of a dynamically assigned IPv4 address has expired, a workstation will send a DHCPDISCOVER message to start the process of obtaining a valid IP address. Because the workstation does not know the addresses of DHCP servers, it sends the message via broadcast, with destination addresses of FF-FF-FF-FF-FF-FF and 255.255.255.255.
- The source address of a multicast transmission is in the range of 18.104.22.168 to 22.214.171.124.
- Multicast transmission can be used by routers to exchange routing information.*
- A single packet can be sent to a group of hosts.*
- Multicast messages map lower layer addresses to upper layer addresses.
- Computers use multicast transmission to request IPv4 addresses.
25. Which three types of nodes should be assigned static IP addresses on a network? (Choose three.)
Explanation: Broadcast messages consist of single packets that are sent to all hosts on a network segment. These types of messages are used to request IPv4 addresses, and map upper layer addresses to lower layer addresses. A multicast transmission is a single packet sent to a group of hosts and is used by routing protocols, such as OSPF and RIPv2, to exchange routes. The address range 126.96.36.199 to 188.8.131.52 is reserved for link-local addresses to reach multicast groups on a local network.
- desktop PCs
- mobile laptops
26. What benefit does DHCP provide to a network?
Explanation: Servers, printers, and intermediary devices, such as routers, switches, and access points should have statically assigned IP addresses so that they are accessible to users and available for remote management.
- DHCP allows users to refer to locations by a name rather than an IP address.
- Hosts always have the same IP address and are therefore always reachable.
- Hosts can connect to the network and get an IP address without manual configuration.*
- Duplicate addresses cannot occur on a network that issues dynamic addresses using DHCP and has static assignments.
27. Which three addresses are valid public addresses? (Choose three.)
Explanation: DHCP provides automatic IP address configuration to hosts on a network. Hosts will be dynamically assigned an address when they connect to the network, although not necessarily the same address each time they connect. If there are static and dynamic addresses used together on the network there could still be the possibility of address conflicts. DNS can be used in conjunction with DHCP to allow users to communicate using names rather than IP addresses.
28. Which number grouping is a valid IPv6 address?
Explanation: The ranges of private IPv4 addresses are as folllows:
10.0.0.0 – 10.255.255.255
172.16.0.0 – 172.31.255.255
192.168.0.0 – 192.168.255.255
29. Refer to the exhibit. A newly purchased client laptop has just connected to the local area network. The local area network is using a wireless router that is providing dynamic addressing as shown. Which IP address does the laptop use as a destination address when requesting a dynamically assigned address?
Explanation: An IPv6 address is made up of 128 bits represented in hexadecimal numbers.There are two rules that help reduce the number of digits needed to represent an IPv6 address.
- Rule 1 – Omit leading zeros in any 16-bit section.
- Rule 2 – Replace any single group of consecutive zeros with a double colon (::). This can only be used once within an IPv6 address.
Networking Basics Final Exam Answers q29
30. Refer to the exhibit. A technician is attempting to configure the IPv6 address 2001:db8::1111::0200 on a device. Why does the device return an error message that indicates the address is not valid?
Explanation: When a new client device is installed on a network that uses dynamic IP addressing, the client will send out a DHCP request message with the destination IPv4 address of 255.255.255.255.
Networking Basics Final Exam Answers q30
- The IPv6 address notation is incorrect.*
- IPv6 is not implemented on this network.
- The device already is configured with an IPv4 address.
- The address is already in use on the network.
31. What type of route is indicated by the code C in an IPv4 routing table on a Cisco router?
Explanation: The IP address entered by the technician is in an invalid notation format because it contains two instances of the double colon (::). When using a shortened IPv6 notation, a double colon can only be used once.
- directly connected route*
- default route
- dynamic route learned from another router
- static route
32. A small accounting office is setting up a wireless network to connect end devices and to provide internet access. In which two scenarios does a wireless router perform Network Address Translation (NAT)? (Choose two.)
Explanation: Some of the IPv4 routing table codes include the following:
C – directly connected
S – static
D – EIGRP
* – candidate default
- when a host is sending packets to the ISP in order to request a speed increase for Internet services
- when a host is sending packets to a local server in order to update the network media settings and music playlists
- when a host is sending packets to a remote site owned by the manufacturer of the wireless router in order to request a digital copy of the device manual*
- when a host is sending a print job to a network printer on the LAN
- when a host is sending HTTP packets to the wireless router in order to update the network addressing of the LAN
33. Refer to the exhibit. A switch with a default configuration connects four hosts. The ARP table for host A is shown. What happens when host A wants to send an IP packet to host D?
Explanation: A wireless router will perform Network Address Translation (NAT) whenever a private (local) source IPv4 address is translated to a public (global) address.
Networking Basics Final Exam Answers q33
- Host A sends out the packet to the switch. The switch sends the packet only to the host D, which in turn responds.
- Host D sends an ARP request to host A.
- Host A sends an ARP request to the MAC address of host D.
- Host A sends out a broadcast of FF:FF:FF:FF:FF:FF. Every other host connected to the switch receives the broadcast and host D responds with its MAC address.*
34. Open the PT activity. Perform the tasks in the activity instructions and then answer the question. Which IP address should be used as the default gateway address on PC0?
Explanation: Whenever the destination MAC address is not contained within the ARP table of the originating host, the host (host A in this example) will send a Layer 2 broadcast that has a destination MAC address of FF:FF:FF:FF:FF:FF. All devices on the same network receive this broadcast. Host D will respond to this broadcast.
Networking Basics Final Exam Answers q34
35. Refer to the exhibit. The IP address of which device interface should be used as the default gateway setting of host H1?
Explanation: The default gateway address identifies a network device through which end user devices on the LAN can communicate with hosts on remote networks. The default gateway is usually the router interface attached to the LAN.
Networking Basics Final Exam Answers q35
- R1: G0/0*
- R2: S0/0/1
- R1: S0/0/0
- R2: S0/0/0
36. A network administrator has a multi-floor LAN to monitor and maintain. Through careful monitoring, the administrator has noticed a large amount of broadcast traffic slowing the network. Which device would you use to best solve this problem?
Explanation: The default gateway for host H1 is the router interface that is attached to the LAN that H1 is a member of. In this case, that is the G0/0 interface of R1. H1 should be configured with the IP address of that interface in its addressing settings. R1 will provide routing services to packets from H1 that need to be forwarded to remote networks.
37. An employee is having connectivity issues. Why might a network technician try to ping the default gateway from the employee laptop?
Explanation: All hosts within a single LAN belong to one broadcast domain. As the number of hosts increase, it could cause more traffic on the segment and may slow network performance. To solve the performance issue, a router would be the device used to segment the single LAN into multiple LANs.
- to verify connectivity with the device that provides access to remote networks*
- to verify that an IP address was provided by the DHCP server
- to determine if the laptop address is included in the DNS server
- to verify that the SVI interface on the switch is configured correctly
38. Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC3. In this scenario, what will happen next?
Explanation: The default gateway address is usually the address of the router interface. The router provides access to remote networks, so a successful ping to the default gateway would mean that the laptop is able to communicate with the router.
Networking Basics Final Exam Answers q38
- SW1 will send an ARP reply with its Fa0/1 MAC address.
- RT1 will send an ARP reply with its own Fa0/0 MAC address.*
- RT1 will send an ARP reply with the PC3 MAC address.
- RT1 will forward the ARP request to PC3.
- RT1 will send an ARP reply with its own Fa0/1 MAC address.
39. Refer to the exhibit. Host H2 sends a unicast message to host H6. Which destination IP address is contained in the header of the packet when it reaches host H6?
Explanation: When a network device has to communicate with a device on another network, it broadcasts an ARP request asking for the default gateway MAC address. The default gateway (RT1) unicasts an ARP reply with the Fa0/0 MAC address.
Networking Basics Final Exam Answers q39
- the IP address assigned to the network adapter on host H2
- the IP address assigned to the network adapter on host H6*
- the IP address of the FastEthernet0/1 interface on router R1
- the IP address of the FastEthernet0/0 interface on router R1
40. Refer to the exhibit. Host A sends a data packet to host B. What will be the addressing information of the data packet when it reaches host B?
Explanation: When host H2 sends the packet to host H6, the source IP address is the address assigned to the network adapter on host H2. The destination address of the packet is the IP address assigned to the network adapter on host H6. The source and destination IP addresses do not change as the packet is forwarded through the routers. When the packet arrives at H6 the destination address of the packet is the address assigned to the network adapter on H6.
Networking Basics Final Exam Answers q40-1
Networking Basics Final Exam Answers q40-2
41. Which command would a technician use to display network connections on a host computer?
42. How are port numbers used in the TCP/IP encapsulation process?
Explanation: The netstat command is a network utility that can be used to display active TCP connections that are open and running on a networked host.
- Source port and destination port numbers are randomly generated.
- Source port numbers and destination port numbers are not necessary when UDP is the transport layer protocol being used for the communication.
- If multiple conversations occur that are using the same service, the source port number is used to track the separate conversations.*
- Destination port numbers are assigned automatically and cannot be changed.
43. Two pings were issued from a host on a local network. The first ping was issued to the IP address of the default gateway of the host and it failed. The second ping was issued to the IP address of a host outside the local network and it was successful. What is a possible cause for the failed ping?
Explanation: Both UDP and TCP use port numbers to provide a unique identifier for each conversation. Source port numbers are randomly generated and are used to track different conversations. Destination port numbers identify specific services by using either a default port number for the service or a port number that is assigned manually by a system administrator.
- The default gateway is not operational.
- The TCP/IP stack on the default gateway is not working properly.
- Security rules are applied to the default gateway device, preventing it from processing ping requests.*
- The default gateway device is configured with the wrong IP address.
44. Open the PT activity. Perform the tasks in the activity instructions and then answer the question. What is the code displayed on the web page?
Explanation: If the ping from one host to another host on a remote network is successful, this indicates that the default gateway is operational. In this scenario, if a ping from one host to the default gateway failed, it is possible that some security features are applied to the router interface, preventing it from responding to ping requests.
- Configured Right
45. A technician is troubleshooting a network connectivity problem. Pings to the local wireless router are successful but pings to a server on the Internet are unsuccessful. Which CLI command could assist the technician to find the location of the networking problem?
Explanation: The IP address configuration on PC0 requires the following:
- IP address – any valid host address on the LAN, except for .254
- Subnet mask – default value for the network
- Gateway – the nearest router interface
- DNS – the DNS server on the ISP network
Networking Basics Final Exam Answers q44-1
46. Which two TCP header fields are used to confirm receipt of data? (Choose two.)
Explanation: The tracert utlility (also known as the tracert command or tracert tool) will enable the technician to locate the link to the server that is down. The ipconfig command displays the computer network configuration details. The ipconfig/renew command requests an IP address from a DHCP server. Msconfig is not a network troubleshooting command.
- acknowledgment number*
- sequence number*
47. When analog voice signals are converted for use on a computer network, in what format are they encapsulated?
Explanation: Together the TCP sequence number and acknowledgment number fields are used by the receiver to inform the sender of the bytes of data that the receiver has accepted.
- IP packets*
48. Refer to the exhibit. An administrator is trying to troubleshoot connectivity between PC1 and PC2 and uses the tracert command from PC1 to do it. Based on the displayed output, where should the administrator begin troubleshooting?
Explanation: When Voice over iP (VoIP) is being used, analog voice signals are translated into digital data in the form of IP packets. This translation allows the phone call to be carried through a computer network.
Networking Basics Final Exam Answers q48
49. A network technician attempts to ping www.example.net from a customer computer, but the ping fails. Access to mapped network drives and a shared printer are working correctly. What are two potential causes for this problem? (Choose two.)
Explanation: Tracert is used to trace the path a packet takes. The only successful response was from the first device along the path on the same LAN as the sending host. The first device is the default gateway on router R1. The administrator should therefore start troubleshooting at R1.
- The Windows domain or workgroup name that is configured on the computer is incorrect.
- The computer has been assigned a static IP address.
- The target web server is down.*
- DNS service is unavailable on the customer network.*
- The HTTP protocol is not working properly on the target server.
50. Open the PT activity. Perform the tasks in the activity instructions and then answer the question. What is the IP address of this server?
Explanation: A ping would fail if the destination device was not operational. It would also fail if the DNS server was unavailable to convert the URL to an IP address. The fact that a computer had a static IP address is not a factor. Even if the target protocol (HTTP) is not functioning, the server would still respond to a ping.
Networking Basics Final Exam Answers q50
51. Which wireless technology allows a customer to connect to a payment terminal in the store with a smartphone?
Explanation: The DNS server resolves Internet names to associated IP addresses.
52. What are two methods typically used on a mobile device to provide internet connectivity? (Choose two.)
Explanation: NFC, or Near Field Communications, is a wireless technology for communication between devices at extremenly short distances and is used in contactless payment systems.
53. What information does an Ethernet switch examine and use to build its address table?
Explanation: Mobile devices commonly use Wi-Fi and cellular to connect to the internet. The cellular connection uses the cellular data network for a fee. The Wi-Fi connection uses an 802.11 wireless network in the area to connect to the internet.
- destination IP address
- destination MAC address
- source IP address
- source MAC address*
54. Which two OSI model layers have the same functionality as two layers of the TCP/IP model? (Choose two.)
Explanation: An Ethernet switch examines the source MAC address of an incoming frame. If the source MAC address is not in the MAC address table, the switch will add it to the table with the associated ingress Ethernet port.
- data link
55. What is the shortest valid representation of the IPv6 address 2001:0DB8:0000:1470:0000:0000:0000:0200?
Explanation: The OSI transport layer is functionally equivalent to the TCP/IP transport layer, and the OSI network layer is equivalent to the TCP/IP internet layer. The OSI data link and physical layers together are equivalent to the TCP/IP network access layer. The OSI session layer (with the presentation layer) is included within the TCP/IP application layer.
56. A college has five campuses. Each campus has IP phones installed. Each campus has an assigned IP address range. For example, one campus has IP addresses that start with 10.1.x.x. On another campus the address range is 10.2.x.x. The college has standardized that IP phones are assigned IP addresses that have the number 4X in the third octet. For example, at one campus the address ranges used with phones include 10.1.40.x, 10.1.41.x, 10.1.42.x, etc. Which two groupings were used to create this IP addressing scheme? (Choose two.)
Explanation: A double colon (::) can replace any single, contiguous string of one or more 16-bit segments (hextets) consisting of all 0s, and can only be used once per IPv6 address. Any leading 0s (zeros) in any 16-bit section or hextet can be omitted.
- personnel type
- device type*
- geographic location*
- support model
57. Refer to the exhibit. If all devices are using a subnet mask of 255.255.255.0, which laptop would have an IP address with the same network number as the server?
Explanation: The IP address design being used is by geographic location (for example, one campus is 10.1, another campus 10.2, another campus 10.3). The other design criterion is that the next octet number designates IP phones, or a specific device type, with numbers starting with 4, but which can include other numbers. Other devices that might get a designation inside this octet could be printers, PCs, and access points.
Networking Basics Final Exam Answers q57
58. For what purpose are IPv4 addresses utilized?
Explanation: The subnet mask shows which part of the IP address is the network number. Because all the devices have a subnet mask of 255.255.255.0, the first three sets of numbers in each IP address indicate the network number. The server and laptop C both have network numbers of 192.168.3.0.
- An IPv4 address is burned into the network card to uniquely identify a device.
- An IPv4 address is used to identify the number of IP networks available.
- An IPv4 address is used to uniquely identify a device on an IP network.*
- An IPv4 address is used to uniquely identify the application that requested the information from a remote device.
59. A user is setting up a home wireless network. A global address is to be used in NAT translations for traffic flowing through the wireless router. How is this global address assigned?
Explanation: A MAC address is burned into a NIC to uniquely identify a device. A port number is used to uniquely identify the application that requested information. The subnet mask identifies how many hosts can be on a network and the network number. There is not really any parameter that identifies the number of free IP networks.
- The wireless router will act as a DHCP client in order to receive global addressing from the ISP.*
- The default gateway IP address of the LAN device is used as the global address for NAT translations through the wireless router.
- The network administrator will choose an available IP address from the LAN and configure the global addressing of the wireless router.
- The host devices will select an unused IP address on the LAN for performing NAT through the wireless router.
60. Match the protocol function to the description while taking into consideration that a network client is visiting a web site.
Explanation: The public (global) address used in NAT is commonly the public IP address that resides on the external facing interface of the wireless router.This IP address is commonly provided via DHCP from the ISP.
Networking Basics Final Exam Answers q60
Explanation: Place the options in the following order:
|A user requests a website by typing in its name.
||Domain Name System
|A service that allows workers to send messages to each other over the Internet.
|A user uploads new files to his or her website.
|A workstation gets its IP address automatically.
||Dynamic Host Configuration
|A user types in a URL and a page loads in the client browser.
|A network technician accesses a network device securely from a remote site.
61. Refer to the exhibit. PC1 needs to resolve the host name of the web server into an IP address by using DNS. What destination IP address and destination port number will PC1 assign to the DNS query packet?
Networking Basics Final Exam Answers q61
- 192.168.20.3 port 53*
- 192.168.10.1 port 53
- 192.168.20.3 port 80
- 192.168.20.2 port 80
- 192.168.20.2 port 53
62. How many bits are in an IPv4 address?
Explanation: To resolve the host name to an IP address a host can send a query to a DNS server. The transport layer port number for DNS is port 53.
63. When a host sends a packet, how does it determine if the destination of the packet is on the same local network or on a remote network?
Explanation: An IPv4 address is comprised of 4 octets of binary digits, each containing 8 bits, resulting in a 32-bit address.
- It compares the source and destination MAC addresses.
- It queries the DNS server with the destination IP address.
- It checks to see if the default gateway is configured.
- It uses the subnet mask to compare the source and destination IP address.*
64. Refer to the exhibit. PC1 attempts to connect to File_server1 and sends an ARP request to obtain a destination MAC address. Which MAC address will PC1 receive in the ARP reply?
Explanation: When a host sends a packet, it uses the subnet mask to compare the source IPv4 address and the destination IPv4 address. If the network bits match, both the source and destination host are on the same local network. Otherwise, the destination host is on a remote network.
Networking Basics Final Exam Answers q64
- the MAC address of the G0/0 interface on R2
- the MAC address of S2
- the MAC address of S1
- the MAC address of File_server1
- the MAC address of the G0/0 interface on R1*
Explanation: PC1 must have a MAC address to use as a destination Layer 2 address. PC1 will send an ARP request as a broadcast and R1 will send back an ARP reply with its G0/0 interface MAC address. PC1 can then forward the packet to the MAC address of the default gateway, R1.