CCNA 1 ITNv6 Chapter 6: Check Your Understanding Answers

CCNA 1 v6.0 Chapter 6: Network Layer: Check your Understanding Answers

1. Which layer of the OSI model is concerned with end-to-end communication over the network?

  • Network
  • Transport
  • Data link
  • Application

Explanation: The network layer, or OSI Layer 3, provides services to allow end-to-end communication across a network.

2. Which of the following is associated with the network layer?

  • IP address
  • Frames
  • MAC address
  • Physical addressing

Explanation: The network layer uses Layer 3 addressing such as IPv4 and IPv6 to identify end hosts.

3. Why was IPv4 designed as a connectionless protocol?

IP is connectionless, which greatly reduces the overhead of IP. Therefore, there is no initial exchange of control information before packets are forwarded, and no additional fields exist in the header to maintain an established connection.

4. On a router, what field in an IPv4 header should be examined to determine that the maximum number of hops have been reached by the packet on its way from the source to this destination?

  • Version
  • DS
  • TTL
  • Protocol
  • Source IP address
  • Destination IP address

Explanation: Time-to-Live (TTL) contains an 8-bit binary value that is used to limit the lifetime of a packet. It is specified in seconds but is commonly referred to as hop count.

5. When configuring a host, the gateway was not configured. How will this affect communication to and from this device?

  • Host communication will not be affected.
  • The host will not be able to communicate with devices by name.
  • Communication will be limited to hosts in the local network.
  • No communication will be successful to or from the host.

Explanation: Without a proper default gateway, a host will not know where to send packets for communication to remote networks. Therefore, the host cannot communication outside its local network.

6. In what part of a router is the current configuration being used located?

  • ROM
  • Flash
  • RAM

Explanation: The running configuration file is located in RAM and is the configuration file that stores the configuration commands that the router IOS is currently using. It is also known as the running config.

7. During the boot process of a Cisco router, you notice a series of hash symbols (#) appearing on the terminal emulator screen from the console session. In what phase is the boot process?

  • Loading the startup configuration
  • Loading the IOS
  • POST
  • Loading the bootstrap

Explanation: During self-decompression of the IOS image file, a string of hash (pound) signs will be displayed.

8. What are the required steps for configuring an interface on a router? (Choose two.)

  • Provide Layer 3 addressing information
  • Add a description to the interface
  • Turn on routing on the interface
  • Activate the interface

Explanation: The requirement for router interface configuration is to provide Layer 3 (IPv4, IPv6, and so on) addressing information and to enable the interface.

9. The ip default-gateway command was not used when configuring a switch. How will this affect network communication? (Choose two.)

  • Host communication through the switch will not be affected.
  • The hosts communicating through the switch will not be able to communicate with devices by name.
  • The host communication through the switch will be limited to hosts in the local network.
  • No communication through the switch will be successful.
  • Communication to and from the switch will be limited to hosts in the local network.

Explanation: A common misconception is that the switch uses its configured default gateway address to determine where to forward packets originating from hosts connected to the switch and destined for hosts on a remote network. Actually, the IP address and default gateway information is only used for packets that originate from the switch.

10. When using the netstat -r command on a host, you see a route What does this route represent?

  • The host has no routes available for forwarding packets.
  • This is a route for testing local communication.
  • Destinations without a specified route are forwarded to the gateway.
  • The host does not have an IP address configured.

Explanation: The local default route (—that is, all packets with destinations that do not match other specified addresses in the routing table—are forwarded to the gateway.



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