Question 1

In OSPF, the A, BR will convert all type 7 L SAs in the NSSA area to type 5 L SAs.

Options :

A : True

B : False

Answer: B

Question 2

The OSPF protocol is run between CE and PE, when CE1 advertises the route of its site to CE2. Which of the following descriptions is incorrect?

Options :

A : whenPE2receivePE1sentBGProutedDomain IDcorrect for all when different from localLSA. PE2will generateType5LSAorType7 LSA

B : whenPE2receivePE1sentBGProutedDomain IDWhen the same as local, forTypel LSAandType2LSA. PE2will generateType3 LSA

C : whenPE2receivePEIsentBGProutedDomain IDSame as local forType3 LSA. PE2will generateType5 LSA

D : PEIconfiguredDomain IDcan be used asBGPThe extended community attribute of is sent with the route toPE2

Answer: C

Question 3

In intra-domain MPLS VPN networks, data packets will be encapsulated with two layers of MPLS when they enter the public network and are forwarded. Label, a description of the two-layer label in the following options. What is wrong is:

Options :

A : MPLS VPNThe outer label is made byLDPprotocol or statically assigneD. the inner label is assigned by the correct end MP-BGPassigned by neighbors

B : By default, the outer label is popped before the packet is forwarded to the last hop device

C : M PLS VPNThe outer layer is labeled as a private network label, and the inner layer label is called a public network label.

D : Layer labels are used inPEThe device sends the packet correctly to the correspondingVPNmiddle

Answer: C,D

Question 4

MPLS is called Multi-Protocol Label Switching. Regarding the label description in MPLS, the correct one is:

Options :

A :

MPLSThe system has a variety of label publishing protocols, such asLDPis a label publishing agreement

B :

Labeled byMIPLSheader of messageBIt has global significance, that is, the label values of all routers cannot be repeated.

C :

A label is a fixed-length identifier with only local significance, which is used to uniquely identify the group to which a group belongs.FEC

D : MPLSSupports single-layer labels as well as multi-layer labels

Answer: A,C,D

Question 5

What is the value of the linkage between OSPF and BFD?

Options :

A : OSPFofhelloThe sending interval is in seconds, more thanBFDInduction link status is fast

B : BFDThe message sending interval can reach the millisecond level, which is less thanOSPFInduction link status is slow

C : Detected at the millisecond levelBFD. associationOSPFstate, fulfilledOSPFThe purpose of quickly sensing the status of the tank

D : BFDAny change in state will not affectOSPFneighbor state

Answer: C