DIKTA Ch3

Question 1

1. Which of the following terms is not commonly used to describe a serial link?

a.)Private line
b.)Point-to-point link
c.)Leased circuit
d.)E-line

Answer 1

d.)E-Line

Question 2

Two routers, R1 and R2, connect using an Ethernet WAN service. The service provides point-to-point service between these two routers only, as a Layer 2 Ethernet service. Which of the following are the most likely to be true about this WAN? (Choose two answers.)

a.)R1 will connect to a physical Ethernet link, with the other end of the cable connected to R2.
b.)R1 will connect to a physical Ethernet link, with the other end of the cable connected to a device at the WAN service provider point of presence.
c.)R1 will forward data-link frames to R2 using an HDLC header/trailer.
d.)R1 will forward data-link frames to R2 using an Ethernet header/trailer.

Answer 2

b.)R1 will connect to a physical Ethernet link, with the other end of the cable connected to a device at the WAN service provider point of presence.

d.)R1 will forward data-link frames to R2 using an Ethernet header/trailer.

Question 3

Imagine a network in which PC1 connects to the same Ethernet LAN as Router1, PC2 connects to the same LAN as Router2, and the two routers connect to each other with a PPP serial link. When PC1 sends data to PC2, and Router1 removes the Ethernet header and trailer, which of the following is true?

a.)Router1 does not use the removed Ethernet header/trailer again.
b.)Router1 re-encapsulates the packet in a PPP frame that uses the Ethernet addresses from the removed header.
c.)Router1 also removes the IP header before forwarding the data to Router2.
d)Router1 re-encapsulates the packet in a new Ethernet frame before forwarding the packet to Router2.

Answer 3

a.)Router1 does not use the removed Ethernet header/trailer again.

Question 4

Which of the following does a router normally use when making a decision about routing TCP/IP packets?

a.)Destination MAC address
b.)Source MAC address
c.)Destination IP address
d.)Source IP address
e.)Destination MAC and IP addresses

Answer 4

c.)Destination IP address

Question 5

Which of the following are true about a LAN-connected TCP/IP host and its IP routing (forwarding) choices?

a.)The host always sends packets to its default gateway.
b.)The host never sends packets to its default gateway.
c.)The host sends packets to its default gateway if the destination IP address is in a different subnet than the host.
d.)The host sends packets to its default gateway if the destination IP address is in the same subnet as the host.

Answer 5

c.)The host sends packets to its default gateway if the destination IP address is in a different subnet than the host.

Question 6

Which of the following are functions of a routing protocol? (Choose two answers.)

a.)Advertising known routes to neighboring routers
b.)Learning routes to directly connected subnets
c)Learning routes as advertised to the router by neighboring routers
d.)Forwarding IP packets based on a packet’s destination IP address

Answer 6

a.)Advertising known routes to neighboring routers

c)Learning routes as advertised to the router by neighboring routers

Question 7

A company implements a TCP/IP network, with PC1 sitting on an Ethernet LAN. Which of the following protocols and features requires PC1 to learn information from some other server device?

a.)ARP
b.)ping
c.)DNS
d.)None of these answers are correct.

Answer 7

c.)DNS