Question 1.
Which of the following are the right description to the backbone area?

A. The backbone area ID is 0.0.0.0.
B. All other areas must connect to the backbone area.
C. Between the backbone areas it can be disconnected.
D. Each ABR (Area Border Router) should be connected to at least one backbone area.

Answer: ABD

Question 2.
Which of the following are the right description to the adjacency between routers in the OSPF protocol?

A. Two routers, if they are in bidirectional adjacency, that is, they receive the Hello message from each other, they automatically become adjacent.
B. If two routers are adjacent, the underlying network between them is probably Point-to-Point.
C. If two routers are adjacent, the underlying network between them is probably Point-to-MultiPoint.
D. If two routers are adjacent, the underlying network between them is probably Broadcast. One of them must be a DR or BDR.
E. Only when the two routers are adjacent will they exchange the LSA message.

Answer: BCDE

Question 3.
Two routers running the OSPF protocol are synchronizing the Link State Database. When you check the peer state machine on one of them, it indicates it has reached the FULL state. 

Therefore, such a conclusion can be drawn that if you check the peer state machine from the other router, it should also indicate that it has reached the FULL state.

A. True
B. False

Answer: B

Question 4.
To view the information of the DR and BDR in the OSPF area, you can use

A. Display ospf
B. Display ospf error
C. Display ospf interface
D. Display ospf peer

Answer: A

Question 5.
Which is wrong about the BGP protocol?

A. BGP is a robust routing protocol.
B. BGP is to check the route loop.
C. BGP can not summary routes of the same type.
D. BGP inherits from EGP

Answer: C

Question 6.
Which of the following is the way to avoid loop in the BGP protocol?

A. Record the source of the route in the attribute: origin
B. Record the AS route in the attribute: AS-Path
C. Record the next hop in the Next-Hop attribute
D. Affect the choice of egress for another AS in the MED attribute

Answer: B

Question 7.
In the BGP protocol, the function of the community attribute NO-EXPORT is to

A. Indicate that the route with this attribute should not be notified to any peer out of the alliance
B. Indicate that the route with this attribute, once received, should not be notified to any BGP peer.
C. Indicate that the route with this attribute, once received, should not be notified to any EBGP peer.
D. None of the above

Answer: A

Question 8.
BGP community is a group of destinations with public attributes. For a network or an AS there can be only one community.

A. True
B. False

Answer: B

Question 9.
RTA notifies RTB about a learned route 1.1.1.0/24 from the EBGP peer. RTA and
RTB are in the same AS.
 
The attributes of the route are listed as the following:
local preference:100
MED: 100
AS_PATH: 200
Origine: EGP
Next_hop: 88.8.8.1/16

The attributes of the received route by RTB will be

A. Local preference: null, MED: 100, 
     AS_PATH: 200 100 ,Origine :EGP, next_hop: 10.110.20.1/16
B. Local preference:100, MED: 100,
    AS_PATH: 200 ,Origine: EGP, next_hop: 88.8.8.1/16
C. Local preference:100, MED: null,
    AS_PATH: EGP, Origine :EGP, next_hop: 10.110.10.1/16
D. Local preference: null, MED: 0,
     AS_PATH: 100 200, Origine: EGP, next_hop: 88.8.8.1/16

Answer: B

Question 10.
Bi-directional Import refers to that routes are imported mutually between routing protocols. To prevent route loop, you can

A. prohibit route redistributing from 2 different routing processes which runs over the same router into each other.
B. Use filter-policy import
C. Use filter-policy export
D. Use fire-wall

Answer: ABC

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