Which of the following description is wrong about sham link?

• A.Sham link can be configured in any area and needs to be configured manually, and there must be a route to the sham link destination address (the sham link endpoint address of the peer PE) in the local VPN instance
• B.In order to forward VPN traffic through the MPLS backbone network, the route cost of the sham link should be less than the OSPF route cost of the backdoor link
• C.Sham link is regarded as a link between two VPN instances. Each VPN instance must have an endpoint address of the sham link, which must be a Loopback with a 32bit mask in the VPN address space on the PE router. interface address
• D.The endpoint address of the Sham link is advertised by BGP as the VPNv4 address. Routes that have passed through the sham link can also be imported into BGP in the form of VPNv4 routes

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What improvements have been made to the IGMPv2 protocol compared to IGMPv1? (Multiple Choice)

• A.Added specific source group query messages
• B.Added maximum response time field
• C.Added off-group messages
• D.Added specific group query message

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ISIS and OSPF are running on a network at the same time. The topology is shown in the figure. The two border routers: RTB and RTC, are respectively configured to import routes, and the devices are connected by one gigabit port, 2.2.2.2/32 network segment is imported into OSPF by import-route-direct on RTD. Assuming that all other configurations are dead and the default configuration, which about the description of this network is wrong?

• A.The following configuration can filter out the routes from the 2.2.2.2/32 network segment of RTD when RTC imports OSPF routes. [RTC-acl-basic-2001]rule 5 deny source 2.0.0.0 0.255.255.255 [RTC-ac1-basic-2001]rule 10 permit RTC-isis-1]filter-policy 2001 import
• B.Adjusting the ISIS priority on RTB to 160 can avoid suboptimal routing problems in the network.
• C.RTB learns the route next hop for the 2.2.2.2/32 network segment is RTA.
• D.Use the following configuration on RTC to filter out only the routes in the 2.2.2.2/32 network segment when importing routes, [RTC]ip ip-prefix 10 index 1 deny 2.0.0.0 8 less-equal 32 [RTC-isis -1]filter-policy ip-prefix 10 import

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A newly deployed HW router is configured for Weighted Random Early Discard (WRED) on the HW network.
WRED has which of the following characteristics? (Multiple Choice)

• A.Global Synchronization is avoided by selectively dropping packets from multiple TCP flows.
• B.Low bandwidth flows are experiencing packet drop at a higher rate than higher bandwidth flows.
• C.For packets of different priorities, WRED can set different packet drop thresholds and packet loss ratios.
• D.When the minimum threshold is crossed, WRED begins dropping all incoming packets (tail-drop).

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Which of the following description about OSPFV3 protocol authentication is wrong?

• A.Huawei router OSPFv3 IPSec certification can not only support transmission mode, but also support tunnel mode
• B.OSPFV3 can only use manual mode to establish SA
• C.OSPFV3 authentication relies on the authentication header and encapsulation security payload header of IPv6 packets
• D.An OSPFv3 protocol header is removed Autype and Authentication field

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