12.3.3 Gateways to Other Networks Quiz Answers

12.3.3 Gateways to Other Networks Quiz Answers. Networking Basics Module 12 quiz exam answers

1. A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?

  • The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host.
  • The packet will be sent directly to the destination host.
  • The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host.
  • The packet will be sent only to the default gateway.

Explanation: If the destination host is in the same LAN as the source host, there is no need for a default gateway. A default gateway is needed if a packet needs to be sent outside the LAN.

2. Typically, which network device would be used to perform NAT for a corporate environment?

  • DHCP server
  • host device
  • router
  • server
  • switch

Explanation: Typically, the translation from private IP addresses to public IP addresses is performed on routers in corporate environments. In a home environment, this device might be an access point that has routing capability or the DSL or cable router.

3. Which characteristic describes the default gateway of a host computer?

  • the logical address of the router interface on the same network as the host computer
  • the physical address of the switch interface connected to the host computer
  • the physical address of the router interface on the same network as the host computer
  • the logical address assigned to the switch interface connected to the router

Explanation: The default gateway is the IP address of an interface on the router on the same network as the sending host.

4. What is the purpose of configuring a default gateway address on a host?

  • to provide a permanent address to a computer
  • to identify the network to which a computer is connected
  • to identify the logical address of a networked computer and uniquely identify it to the rest of the network
  • to identify the device that allows local network computers to communicate with devices on other networks

Explanation: When a host or device needs to communicate with hosts or devices on other networks, the configuration of a default gateway address is necessary so that the host or device can send data to remote networks.

5. If the default gateway is configured incorrectly on a host, what is the impact on communications?

  • The host is unable to communicate on the local network.
  • The host is unable to communicate with hosts on remote networks.
  • The host is unable to communicate with hosts on both the local and remote networks.
  • The host cannot get an IP address from the DHCP server.

Explanation: In data communication, the default gateway device is involved only when a host needs to communicate with other hosts on another network. The default gateway address identifies a network device that a host device uses to communicate with devices on other networks. The default gateway device is not used when a host communicates with other hosts on the same network.

6. Which three IPv4 network addresses are private IP addresses? (Choose three.)

  • 10.0.0.0
  • 172.32.0.0
  • 192.157.0.0
  • 172.16.0.0
  • 192.168.0.0
  • 224.6.0.0

Explanation: The reserved private IPv4 network addresses include 10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, and 192.168.0.0 to 192.168.255.255.

7. What is the purpose of NAT?

  • allowing hosts configured with registered public IP addresses to access the internet
  • translating private IP addresses to a public registered IP address
  • routing private IP addresses over the public internet
  • assigning a private IP address to a host for internet access

Explanation: NAT translates host internal private IP addresses to one or more registered public IP addresses in order for the host to access sites through the internet.

8. What is the primary advantage of using NAT?

  • allows a large group of users to share one or more public IP addresses
  • allows a large group of users to share the same private IP address within a LAN
  • allows static mapping of public inside addresses to private outside addresses
  • allows dynamic mapping of registered inside addresses to private outside addresses

Explanation: Network Address Translation (NAT) can allow a large group of privately addressed hosts to share one or more registered public IP addresses in order to route packets over the internet.

9. Which three settings must be configured on a PC in order for it to communicate with devices located across the internet? (Choose three.)

  • IP address
  • subnet mask
  • default gateway address
  • DHCP server address
  • hostname

Explanation: A PC must be configured with an IP address, subnet mask, and a default gateway address in order to be able to communicate with devices located on a different IP network. This includes devices that are reached through the internet.

10. The default configuration on a home wireless router provides which type of addresses to devices using DHCP?

  • private IP addresses
  • public registered IPv4 addresses
  • public registered IPv6 addresses
  • vendor-specific MAC addresses

Explanation: By default, home wireless routers give out private IPv4 addresses to devices on the home network. These addresses are usually in the 192.168.0.0 reserved range.

11. Which type of intermediary device acts as a boundary between a home wireless network and the internet?

  • Layer 2 switch
  • access point
  • DNS server
  • wireless router

Explanation: A wireless router acts as a network boundary for the attached IP networks. Most home network wireless routers connect a privately addressed local LAN to an external IP network connected to an ISP.

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