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Which of the following are true about a LAN-connected TCP/IP host and its IP routing (forwarding) choices? (Choose two answers)Question 9Select one or more:The host sends packets to its default gateway if the destination IP address is in a different class of IP network than the host.The host sends packets to its default gateway if the destination IP address is in the same subnet as the host.The host always sends packets to its default gateway.The host sends packets to its default gateway if the destination IP address is in a different subnet than the host.

Question

Which of the following are true about a LAN-connected TCP/IP host and its IP routing (forwarding) choices? (Choose two answers)Question 9Select one or more:The host sends packets to its default gateway if the destination IP address is in a different class of IP network than the host.The host sends packets to its default gateway if the destination IP address is in the same subnet as the host.The host always sends packets to its default gateway.The host sends packets to its default gateway if the destination IP address is in a different subnet than the host.

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Solution

The correct answers are:

  1. The host sends packets to its default gateway if the destination IP address is in a different subnet than the host.
  2. The host sends packets to its default gateway if the destination IP address is in a different class of IP network than the host.

Explanation:

  1. In a TCP/IP network, a host uses its default gateway (usually a router) to send packets to destinations that are not in the same subnet. The host determines whether the destination is in the same subnet by comparing its own IP address and subnet mask with the destination IP address.

  2. The concept of IP classes is somewhat outdated due to the introduction of Classless Inter-Domain Routing (CIDR), but the principle still applies. If the destination IP address is in a different class (A, B, or C), it is by definition in a different network, and the host will send the packet to its default gateway.

The other two options are incorrect because a host does not always send packets to its default gateway (it can send packets directly to destinations in the same subnet), and it does not send packets to its default gateway if the destination IP address is in the same subnet (it sends them directly).

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Routing performed by a host (like a PC) is characterised by:Question 5Select one:It performs routing in exactly the same way as a network-based router doesIt has to make routing decisions only about datagrams that come from its own subnetIt has no routing decisions to make.It has to make routing decisions only about datagrams that are generated by that same host

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