Which statement is true of a source that wants to transmit multicast traffic to group 239.1.1.1？（）

When a BGP router is not capable of understanding 4-byte AS numbers， it will see 4-byte AS numbers as a special， reserved， 2-byte AS number in the AS path. Which 2-byte AS number is this reserved one？（）

What does a unicast prefix-based IPv6 multicast address start with？（）

For the following items，what is the mathematical relationship between the committed information  rate （CIR）， committed burst （Bc）， and committed rate measurement interval （Tc）？（）

You are the network administrator of a Layer 3 switched network. Users in one VLAN are complaining that access to the server VLAN is very slow from time to time. Traffic in the local VLAN works without any issue， and users in other VLANs do not have any complaint to reach the server VLAN. What is most likely the cause of this issue？（）

Internet Protocol version 6 （IPv6） is the next-generation Internet Layer protocol for packet-switched internetworks and the Internet. IPv6 router solicitation is（）

Which statement best describes OSPF external LSAs （type 5）？（）

Phase I and Phase II DMVPN differ in terms of which of these characteristics？（）

What are the "bound IP addresses" used for in LDP？（）

Which router is doing LSA type 7 to type 5 translation，and why？（）