a. In MPLS, is selecting the best interface for each packet at each router done when the packet enters the network or before?

17a.) In MPLS, the router interface to send the packet back out will be decided _________.

a. During the router's routing process

b. Before the first data packet is sent

c. By a dynamic routing protocol

d. None of the above

17a.) In MPLS, if two packets arrive in order going to the same IP address, MPLS will _________.

a. Send the second on doing a simple cache lookup

b. Go through the entire routing process for the second packet

c. Will do a simple table lookup for the second packet

d. None of the above

b. Why is this beneficial?

17b.) Which spends less processing time on each packet arriving at a router.

a. Traditional routing

b. MPLS

c. Both spend about equal time.

c. What is the name of the path selected for a particular conversation?

17c.) MPLS _________ the work that each router must do to deliver a packet during a traffic exchange.

a. Reduces

b. Increases

c. Does not affect

d. Occasionally reduces

d. When a source host first transmits to a destination host after a label switched path is established, what will happen?

17d.) In MPLS, the _________ adds the label to the packet.

a. Source host

b. First label-switching router

c. Either A or B

d. Neither A nor B

e. Do label switching routers along the MPLS path look at the packet’s IP address? The answer is not explicitly in the text. Explain your reasoning.

17e.) In MPLS, the label-switched routers in the middle do not look at a packet’s IP address.

a. True

b. False

f. On what basis does each label switching router base routing decisions?

17f.) MPLS routers base their decisions on a packet's _________.

a. Destination IP address

b. Label number

c. Both A and B

d. Neither A nor B

g. Why is MPLS transparent to the source and destination hosts?

17g.) MPLS is _________ the source and destination hosts.

a. Transparent to

b. Nontransparent to

c. Apparent to

d. A burden on

h. What are MPLS’s attractions?

17h.) MPLS brings _________.

a. Lower cost than the Internet

b. The ability to do traffic engineering

c. Both A and B

d. Neither A nor B

i. What is traffic engineering?

j. How does the price of using MPLS service compare with the cost of simply sending traffic over the Internet?

17j.) Which of the following is the most expensive to use?

a. Traditional routing

b. MPLS

c. Carrier Ethernet

d. The Internet

k. Why do firms pay this price difference?

17k.) Firms generally pay the added cost of MPLS for connecting their sites _________.

a. Because it has higher transmission speeds

b. Because it can do traffic engineering

c. Because it uses familiar technology

d. All of the above