A.S field in the label is 1bit

B.The TTL field in the label and the TTL (Time To Live) in the IP packet.

C.For the packets of Ethernet and PPP, the label stack is located between the Layer 2 header and the data like the 'cushion layer': when there is a VLAN tag, the MPLS header is placed between the Ethernet header and the VLAN tag

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

A.FALSE

B.TRUE

A.link

B.Subnets

C.Equipment

D.Nesting of other subnets is not available under the subnet

A.DHCP dynamic allocation of IP addresses has a long response 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.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

A.R1 has 3002

B.R1 does not have 3002

C.If no routing policy about AS_Pash is configured, then 3002

D.If no routing policy about AS_Path is configured, then 3002