A.FALSE

B.TRUE

A.R1access172.16.1.4have2an equivalent path

B.R1access172.16.1.4.need to go through2hop router

C.R1access172.16.1.4,need to go through4hop router

D.R1access172.16.1.4have4an equivalent path

A.The S field in the label: 1 bit, used to identify whether the label is the bottom label of the stack, when the value is 1, it indicates the second-to-last label

B.The total length of a single MPLS label is 4 bytes (32 bits)

C.For Ethernet and PPP packets, the label stack is located between the layer 2 header and the data like a "underlay*": when there is a VLAN tag, the MPLS header is placed between the Ethernet header and the VLAN tag

D.The TTL field in the label is similar to the TTL (Time To Live.) in the IP packet, and it also has the effect of preventing loops.

A.False

B.True

A.The interval for sending Level-2 hello packets on this interface is 5s

B.The interval for sending Level-1 hello packets on this interface is 5s

C.The interval for sending Level-2 CSNP packets of this interface is 5s

D.The hello packet sending interval of Level-1 and Leval-2 of this interface is 3s.