wide area networks interview question

6.

Which encapsulations can be configured on a serial interface?

Ethernet
Token Ring
HDLC
Frame Relay
PPP

A.     1 and 4
B.     2 only
C.     3, 4 and 5
D.     All of the above
Answer & Explanation

Answer: Option C

Explanation:

Ethernet and Token Ring are LAN technologies and cannot be configured on a serial interface. PPP, HDLC, and Frame Relay are layer 2 WAN technologies that are typically configured on a serial interface.
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7.

Suppose that you have a customer who has a central HQ and six branch offices. They anticipate adding six more branches in the near future. They wish to implement a WAN technology that will allow the branches to economically connect to HQ and you have no free ports on the HQ router. Which of the following would you recommend?
A.     PPP
B.     HDLC
C.     Frame Relay
D.     ISDN
Answer & Explanation

Answer: Option C

Explanation:

The key is “there are no free ports” on your router. Only Frame Relay can provide a connection to multiple locations with one interface, and in an economical manner no less.
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8.

Which of the following command options are displayed when you use the Router# show frame-relay ? command?

dlci
neighbors
lmi
pvc
map

A.     1 only
B.     2 and 4
C.     3, 4 and 5
D.     All of the above
Answer & Explanation

Answer: Option C

Explanation:

The show frame-relay ? command provides many options, but the options available in this question are lmi, pvc, and map.
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9.

In which of the following technologies is the term HFC used?
A.     DSL
B.     PPPoE
C.     Frame Relay
D.     Dedicated T1
Answer & Explanation

Answer: Option D

Explanation:

In a modern network, hybrid fibre-coaxial (HFC) is a telecommunications industry term for a network that incorporates both optical fiber and coaxial cable to create a broadband network.
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10.

A default Frame Relay WAN is classified as what type of physical network?
A.     Point-to-point
B.     Broadcast multi-access
C.     Non-broadcast multi-access
D.     Non-broadcast multipoint
Answer & Explanation

Answer: Option C

Explanation:

Frame Relay, by default, is a non-broadcast multi-access (NBMA) network, which means that broadcasts, such as RIP updates, will not be forwarded across the link by default.

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