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单选题Three IS-IS routers on a broadcast segment have different priority values configured. Which router is elected the DIS on that broadcast segment?（）A the router with the lowest priorityB the router with the highest priorityC the router with the highest S

题目
单选题
Three IS-IS routers on a broadcast segment have different priority values configured. Which router is elected the DIS on that broadcast segment?（）
A

the router with the lowest priority

B

the router with the highest priority

C

the router with the highest System ID

D

the router with the highest IP address

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相似问题和答案

第1题：

There are three routers on a Gigabit Ethernet LAN: Router A, Router B, and Router C. Router A is the Designated Intermediate System (DIS) at Level 1 for that LAN. Router A‘s DIS priority is 64. The LAN is a Level 1-only link. Router D has just been powered up on that same LAN and its DIS priority is 80.Which statement is true?（）

A. Router A remains the DIS and generates a new pseudonode LSP for that LAN

B. Router A remains the DIS and NO new pseudonode LSP is generated for that LAN

C. Router D becomes the new DIS, generates a new pseudonode LSP for that LAN, and purges the old pseudonode LSP generated by Router A

D. Router D becomes the new DIS, does NOT generate a new pseudonode LSP for that LAN, and does NOT purge the old pseudonode LSP generated by Router A


参考答案：C

第2题：

Three IS－IS routers on a broadcast segment have different priority values configured. Which router is elected the DIS on that broadcast segment?()

A. the router with the lowest priority

B. the router with the highest priority

C. the router with the highest System ID

D. the router with the highest IP address


参考答案：B

第3题：

Which of the following correctly describe the various functions and virtues of a router? (Select all valid answer choices)

A. Packet switching

B. Collision prevention on a LAN segment.

C. Packet filtering

D. Broadcast domain enlargement

E. Broadcast forwarding

F. Internetwork communication

G. None of the above


正确答案：ACF
A,C,F 解析：Explanation:
The main function of a router is to connect different, separated networks together. In doing so, switching packets from one network to another is a primary function, along with providing for communication between networks. As an additional feature, routers are capable of providing filtering on a network address and application port level, so choice C is also correct.

Incorrect Answers:
B. Routers can indeed be used to segment a network separate a collision domain, since routers do not forward LAN broadcasts and multicasts to other interfaces. However, routers alone can not prevent all collisions from occurring on any given LAN segment.

D. Routers actually segment LANs into smaller broadcast domains.

E. Routers do not forward broadcast and multicast traffic out the additional interfaces by default. Unless bridging or IP helpers are configured on the router, LAN broadcasts are blocked at the router level.

第4题：

In the IS-IS Designated Intermediate System （DIS） election process， which criteria is used for DIS selection？（）

  • A、highest router ID first， then highest priority
  • B、highest MAC address first， then highest priority
  • C、highest router ID first， then highest MAC address
  • D、highest priority first， then highest router ID
  • E、highest priority first， then highest MAC address

正确答案:E

第5题：

Which of the following devices separates a LAN segment into two collision domains, without affecting the broadcast domain?()

A.Firewall

B.Bridge

C.Repeater

D.Router


参考答案：B

第6题：

Which OSPF router will advertise a Type 2 network LSA for a broadcast network segment?()

A.A

B.B

C.C

D.D


参考答案：A

第7题：

If all OSPF routers on a broadcast network have the same OSPF priority, what parameter is used to determine the new BDR at the time of a DR failure?()

A. area ID

B. router ID

C. loopback address

D. IP address of interface on broadcast network


参考答案：B

第8题：

A multicast router may receive thousands of multicast(71)every day for different groups. If a router has no knowledge about the membership status of the(72), it must broadcast all of these packets. This creates a lot of traffic and consumes(73). A better solution is to keep a list of groups in the network for which there is at least one loyal member.(74)helps the multicast router create and update this list. For each group, there is one router that has the duty of distributing the(75)packets destined for that group. This means that if there are three multicast routers connected to a network, their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group.

A．packets

B．errors

C．reports

D．alarms


正确答案：A

第9题：

What is the purpose of the OSPF router ID in a OR／BOR election?()

A. It is used with the OSPF priority values to determine which OSPF router will become the DR or BOR in a point-to-point network

B. It is used with the OSPF priority values to determine which interface will be used to form a neighbor relationship with another OSPF router

C. It is used with the OSPF priority values to determine which router will become the DR or BOR in a multi access network

D. It is used to determine which interfaces will send Hello packets to neighboring OSPF routers


参考答案：C

第10题：

If all OSPF routers in a single area are configured with the same priority value,what value dose a router use for the ODPF router ID in the absence of a loopback interface?（）

  • A、the IP address of the first Fast Ethernet interface
  • B、the IP address of the console management interface
  • C、the highest IP address among its active interfaces
  • D、the lowest IP address among its active interfaces
  • E、the priority value until a loopback interface is configured

正确答案:C

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