juniper认证考试

Two Level 1 routers are exchanging Hello packets with different Area IDs.What occurs between these routers?（）A、An Adjacency is formed.B、No IS-IS PDUs are sentC、An Adjacency does not form.D、An Adjacency forms but traffic is not forwarded.

题目

Two Level 1 routers are exchanging Hello packets with different Area IDs.What occurs between these routers?（）

  • A、An Adjacency is formed.
  • B、No IS-IS PDUs are sent
  • C、An Adjacency does not form.
  • D、An Adjacency forms but traffic is not forwarded.
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相似问题和答案

第1题：

Two Level 2 routers are exchanging Hello packets with different Area IDs.What occurs between these routers?()

A. An Adjacency is formed.

B. No IS-IS PDUs are sent.

C. An Adjacency does not form.

D. An Adjacency forms but traffic is not forwarded.


参考答案：A

第2题：

Which two statements are true by default of a multilevel IS－IS network?()

A. Level 1 only routers see routes contained in their area.

B. Level 1 routers route towards Level 2 routers due to the attached bit.

C. Level 2 routers route towards Level 1 routers due to the attached bit.

D. Level 2 routers can see routes in other Level 2 areas and routes originated in Level 1 areas.


参考答案：A, D

第3题：

Routers A and B are connected with a point-to-point OC-3 interface. Each router‘s OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in the same area.How many IS-IS adjacencies exist between the two routers?（）

A.0

B.1

C.2

D.3


参考答案：C

第4题：

Which two statements are correct regarding IS-IS?（）

  • A、Routers maintain a single link-state database per area.
  • B、Routers maintain a separate Level 1 link-state database.
  • C、Routers maintain a separate Level 2 link-state database.
  • D、Routers maintain a single Level 1 link-state database across multiple areas.

正确答案:B,C

第5题：

Which two statements are true about IS － IS?()

A.Interfaces have a default metric of 1.

B.Level 1 is intra - area and level 2 is interarea.

C.Level 1 routing is between an end system (ES) and IS while Level 2 routing is between an IS and IS.

D. Hosts send ISHs while routers send ESHs.

E. IS - IS is an open standard.

F. Metrics depend on interface speed.


参考答案：B, E

第6题：

Which two conditions, when met, allow an IS－IS Level 2 router to be considered attached?()

A. You can reach other Level 2 routers.

B. It can reach at least one other defined area.

C. The router is reachable by at least two ES-IS nodes.

D. It has at least one enabled reachable prefix with a valid metric defined.


参考答案：B, D

第7题：

Routers A and B are connected with a point-to-point OC-3 interface. Each routers OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in different areas. How many IS-IS adjacencies exist between the two routers?（）

A.0

B.1

C.2

D.3


参考答案：B

第8题：

Two Level 1 routers are exchanging Hello packets with different Area IDs.What occurs between these routers?()

A. An Adjacency is formed.

B. No IS-IS PDUs are sent

C. An Adjacency does not form.

D. An Adjacency forms but traffic is not forwarded.


参考答案：C

第9题：

How do routers in an IS-IS Level-1 domain exit to reach other Level-1 （L1） domains？（）

  • A、Level-1（L1） routers use default routes announced by Level-2（L2） routers in Level-1（L1） domain
  • B、Level-1 routers use default routes installed based on ATT bit （Attach Bit） in announcements from Level-1-2（L1/L2） router
  • C、Level-1 routers use specific routes， for other Level-1 domain， announced by Level-1-2（L1/L2） by route-leaking feature of Cisco IOS
  • D、Level-1 routers use specific routes， for other Level-1 domain， announced by Level-2（L2） by route-leaking feature of Cisco IOS

正确答案:B,C

第10题：

Which two statements about IS reachability TLV (TLV 2) and the extended IS reachability (TLV 22) are true?（）

  • A、TLV 22 supports wide metrics.
  • B、TLV 2 is only used in Level 1 routers.
  • C、TLV 22 displays the neighbor's extended areas.
  • D、Only TLV 22 can support the inclusion of sub-TLVs.

正确答案:A,D

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