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When a router that runs BGP receives an unreachable route from a peer, which of the following measures will be taken by the router?

A.

It accepts the route and adds the route to the IP routing table.

B.

It replies with an error message to notify the peer that the route is unreachable.

C.

It accepts the route and adds the route to the BGP routing table.

D.

It discards the route.

An OSPF area ID identifies an OSPF area. Which of the following OSPF area IDs is equivalent to 0.0.1.0?

A.

1

B.

255

C.

256

D.

10

Which of the following address types is not supported by IPv4?

A.

Multicast

B.

Anycast

C.

Unicast

D.

Broadcast

In BGP, the Origin attribute is used to identify the origin of a route. Which of the following statements are true about the Origin attribute?

A.

If a route is imported to BGP by the originator using the network command, the Origin attribute of the BGP route is displayed as i in the BGP routing table.

B.

If a route is learned through EGP, the Origin attribute of this BGP route is displayed as ? in the BGP routing table.

C.

If multiple routes carry the same destination address but different Origin attributes and all other route selection conditions are the same, BGP selects the optimal route according to the Origin attribute in the following order: IGP > EGP > Incomplete.

D.

This attribute is a well-known mandatory attribute.

As shown in the figure, SWA, SWB, and SWC run the Rapid Spanning Tree Protocol (RSTP). What are the roles of SWB ' s GE0/0/2 and SWC ' s GE0/0/1?

A.

Backup port, alternative port

B.

Alternative port, backup port

C.

Backup port, root port

D.

Root port, designated port

On an OSPF network, two directly connected routers fail to establish a neighbor relationship. The display ospf error command is run on one of the routers, and the command output is as follows:

Based on the command output, which of the following is the cause of the problem?

A.

OSPF Auth Types are the same.

B.

OSPF router IDs are the same.

C.

OSPF area IDs are the same.

D.

OSPF Auth Data values are the same.

IS-IS has multiple types of packets, each with different functions. Which of the following types of packets is used to establish and maintain neighbor relationships?

A.

IIH

B.

CSNP

C.

PSNP

D.

LSP

Hackers often obtain the login permissions of system administrators through various attacks.

Which of the following measures can be taken to enhance the security of administrator accounts? (Select all that apply)

A.

Periodically check whether unnecessary administrator accounts exist in the system. If such accounts exist, delete them to reduce the attack surface.

B.

Encrypt passwords before transferring them. Whenever possible, transfer passwords by email.

C.

Assign exclusive accounts for administrators with different maintenance roles to avoid account sharing.

D.

To ensure security and make the password easier to remember, you can set the password to be valid for a long time.

During routine maintenance, an enterprise administrator runs a command to check VRRP group information. Which of the following statements is false about the command output?

yaml

CopyEdit

< HUAWEI > display vrrp verbose

Vlanif100 | Virtual Router 1 State: Master

Virtual IP: 10.1.1.100

Master IP: 10.1.1.2

PriorityRun: 120 PriorityConfig: 120

DR: None BDR: None MTU: 0

Preempt: YES Delay Time: 20s

Remain: --

Track: YES Priority Reduced: 20

Auth Type: MD5

BFD-session State: UP

A.

Preemption is enabled for the VRRP group.

B.

This VRRP group is an mVRRP group.

C.

Authentication is enabled for the VRRP group.

D.

The ID of the VRRP group is 1.

During the DHCP interaction process, the DHCP server and client exchange various types of packets. Which of the following packets is not sent from the client to the server?

A.

DHCP Release

B.

DHCPNAK

C.

DHCP Request

D.

DHCP Discover