H12-221：最新的Huawei認證H12-221考題，HCNP-R&S-IERN (Huawei Certified Network Professional-Implementing Enterprise Routing Network)認證

問題1
Which of the following statements are correct regarding how OSPF detects old or duplicate LSAs? (Select 3 answers)

A. The smaller the LS age, the more recent the LSA.

B. An LSA can be flushed from the routing domain by setting its LS age to equal the Maxage.

C. The lower the sequence number, the more recent the LS

D. A router uses 0x80000001 as the sequence number when it generates the first LSA.

正確答案: A,B,D

問題2
How many multicast IP addresses can be represented by an IP multicast MAC address?

A. 23

B. 24

C. 1

D. 32

正確答案: D

問題3
Which of the following statements regarding the MED attribute are true? (Select 3 answers)

A. Generally, BGP compares only the MEDs of routes received from the same AS but if the "compare-different-as-med" command is configured, BGP can compare the MEDs of the routes received from multiple ASs.

B. Based on BGP route selection rules, the MED has precedence over the AS_Path, Preferred-Value, Local-Preference, and Origin attributes.

C. the default MED value 0 on a BGP indicates that the route is not specified. If the bestroute med-none-as-maximum command is configured, the maximum MED value that can be set is 4294967295.

D. The MED of a BGP route is 100 by default.

正確答案: A,B,C

問題4
ABRs advertise link state information about non-backbone areas into backbone areas. The backbone area then advertises the routing information into other non-backbone areas. Link state information about the backbone area cannot be advertised into non-backbone areas.

A. TRUE

B. FALSE

正確答案: B

問題5
What are the differences between the IGMP versions 1, 2 & 3? (Select 2 answers)

A. IGMPv1/v2 cannot elect devices which may send queries but IGMPv3 can.

B. IGMPv2/v3 members can actively leave groups, whereas in IGMPv1members cannot

C. IGMPv1/v2 do not support the SSM service model but IGMFV3 does.

D. IGMPv1/v2 do not support group-specific queries but IGMPv3 does.

正確答案: B,C

問題6
Route filtering can filter not only routing information but also link-state information.

A. TRUE

B. FALSE

正確答案: B

問題7
How does an IGMP router maintain group memberships on a network? (Select 2 answers)

A. The router periodically sends Query messages. After a receiver host receives the Query message, the receiver host sends a Report message.

B. A receiver host periodically sends a Report message.

C. The router maintains a timer for each group membership which it refreshes for hosts that send report messages and deletes the group membership of hosts that do not.

D. The router deletes a group membership only when it receives a Leave message for this group.

正確答案: A,C

問題8
A router can be configured to run only one BGP routing process.

A. TRUE

B. FALSE

正確答案: A

問題9
The ABR of an NSSA does not advertise Type-4 and Type-5 LSAs to an NSSA instead it imports external routes into the NSSA,

A. TRUE

B. FALSE

正確答案: A

問題10
Which of these statements is true when configuring MD5 authentication between BGP peers?

A. A pair of BGP peers must use the same MD5 password.

B. Every BGP peer of a router must use a unique MD5 password.

C. All BGP peers must use the same MD5 password.

D. All routers in the same AS must use the same MD5 password.

正確答案: A

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