A. When traffic exceeds the minimum threshold, WRED starts dropping all ingress traffic (tail drops).

B. Avoid global synchronization by selectively dropping multiple TCP streams Low-bandwidth traffic is easier to drop than high-bandwidth traffic

C. WRED can set different drop thresholds and packet loss rates for packets of different priority

A. PIM Join messages for the multicast tree are only sent when the multicast tree is first established

B. PIM Join messages are sent every 3 minutes, and status

C. The upstream router sends a PIM Join acknowledgment in response to each PIM Join message received from the downstream router

D. The PIM Join message is sent every 60 seconds to refresh the status of the upstream router mroute for the multicast tree

A. After NSF is enabled, the router is switched back, and the routing table and forwarding table remain unchanged, so traffic is not lost during grf time

B. After NSR enablement, if the business batch backup has not yet ended, a master board failure occurs, the NSR cannot be completed

C. NSF routers do not need to negotiate the ability to support NSF through specific messages

D. NSR backers require the ability to support NSR through specific message negotiation

A. Both packets need to be confirmed to the terminal router after being sent, otherwise they need to be retransmitted

B. Once the adjacency relationship is established, the CSRP packet and the D message will stop sending

C. The two packets do not need to be confirmed to the router after they are sent the master-slave relationship in the DD message interaction of

D. OSPF is not identity bound to dr/BDR; the CSN message is generated only by DIS

A. You can use the AS_ CONFED_SET attribute to prevent loops within a consortium.

B. The AS_ PATH attribute is used between autonomous systems to prevent ring cats

C. The Cluster List property is used for loop guard within the reflector cluster, and the router rejects the route when it finds that the Cluster List of the route entry contains its own Cluster ID.

D. Routes learned from IBGP are not advertised to IBGP neighbors and are used to prevent routing loops inside the AS.