H12-831-ENU 무료 덤프문제 온라인 액세스

What are the reasons why DHCP faces many security threats? (Multiple choice)

• A.The man-in-the-middle exploits the fake IP-to-MAC mapping relationship to deceive both the DHCP client and the server at the same time
• B.Because the DHCP discovery message (DHCPDISCOVER) is sent in the form of broadcast
• C.DHCP Server cannot distinguish what kind of CHADDR is super legal and what kind of CHADDR is illegal
• D.DHCP dynamic allocation of IP addresses has a long response time

IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculation. As shown in the figure, a campus deploys both IPv4 and IPv6 and runs IS-IS to achieve network interconnection, of which R2 only supports IPv4.

Which of the following statements is true about the topology calculation of this network?

• A.If you want IPv4 and IPv6 network computation to form the same shortest path tree, you need to run the ipv6 enable topology ipv6 command to enable the IPv6 capability of the IS-IS process
• B.By default, IPv4 and IPv6 networks will be calculated separately to form different shortest path trees
• C.By default, since R2 does not support Pv6
• D.By default, in the shortest path tree formed by IPv6 network calculation, the path from R1 to R4 is R1-R2-R4

As shown in the figure, OSPF is enabled on all interfaces of the router. The ip address marked in the figure is the IP address of the loopback0 interface. The Loopback0 of R1, R2, and R3 is advertised in area 1, and the Loopback0 of R4 is advertised in area 0, Loopback0 of R5 announces which of the following functional addresses in area 2 can ping each other?

• A.10.0.2.2 and 10.0.3.3
• B.10.0.4.4 and 10.0.2.2
• C.10.0.3.3 and 10.0.5.5
• D.10.0.2.2 and 10.0.5.5

What information about a packet can be marked or remarked? (Multiple choice)

• A.IP Source
• B.MAC Address information
• C.Any information in the message
• D.IP DSCP

During network troubleshooting, you try to ping the opposite destination host and find that all packets are lost.
So what is the best way to troubleshoot next?

• A.Confirm the business traffic path
• B.Contrastive configuration method
• C.Bottom-up approach
• D.Top-down approach