Which of the following descriptions of MED is correct? (Multiple choice)

• A.MED can only be delivered within this AS
• B.The default value of MED is 100
• C.MED is an optional non-transitional attribute
• D.The default value of MED is 0

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What are the main components of the SNAP address used by the IS-IS protocol? (Multiple choice)

• A.SEL
• B.DSCP
• C.SYSTEM ID
• D.SEL

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Which of the following descriptions of the LSA age field is correct? (Multiple choice)

• A.If the LS age of an LSA reaches LSRefreshTime (30min), any router can regenerate an instance of the LSA for this LSA
• B.If the LS age of an LSA reaches LSRefreshTime (30min), the producer of this LSA needs to regenerate an instance of the LSA
• C.The unit of LSA age is second, the LS age of LSA in LSDB increases with time
• D.The unit of LSA age is second, the LS age of LSA in LSDB decreases with time

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Regarding the ABR in OSPF, which of the following description is wrong?

• A.There are multiple LSDBs on the ABR, and the ABR maintains one LSDB for each area
• B.ABR cannot generate Type 3, Type 4, or Type 5 LSA
• C.Convert the Type 1 and Type 2 LSAs in the connected non-skeletal area into Type 3 LSAs and publish them to the backbone area
• D.The Type 1, Type 2, and Type 3 LSA in the backbone area of the ABR are converted to Type 3 LSA and published to the connected non-skeletal area

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Regarding the description of the characteristics of the routing strategy, which is correct?

• A.Forwarding according to the routing table based on the destination address
• B.Based on the forwarding plane, serving the forwarding strategy
• C.Application command policy- based-route
• D.Manual hop-by-hop configuration is required to ensure that packets are forwarded according to the policy

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