A.6to4
B.6over4
C.ISATAP
D.6PE
E.GRE

A. Both support normal and extended VLAN ranges.
B. ISL is a Cisco proprietary encapsulation method and 802.1Q is an IEEE standard.
C. ISL encapsulates the original frame.
D. Both support native VLANs.
E. 802.1Q does not encapsulate the original frame.

A.EIGRPv6 will form a neighbor relationship.
B.EIGRPv6 will not form a neighbor relationship.
C.EIGRPv6 will form a neighbor relationship， but with the log MSG： "EIGRPv6 neighbor not on a commonsub net."
D.EIGRPv6 will form a neighbor relationship， but routes learned from that neighbor will not be installed inthe routing table.

A. It supports autonegotiation for both ISL and IEEE 802.1Q trunks.
B. It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk.
C. It is a point-to-multipoint protocol.
D. It is a point-to-point protocol.
E. It is not supported on private VLAN ports or tunneling ports.

A.link local
B.area wide
C.AS wide
D.reserved

A. 802.1D bridges do not relay BPDUs.
B. 802.1w bridges do not relay BPDUs.
C. 802.1D bridges only relay BPDUs received from the root.
D. 802.1w bridges only relay BPDUs received from the root.

A.A router solicitation is sent on that interface.
B.There is a duplicate address detection on the host interface.
C.The link local address is assigned on the host interface.
D.A neighbor redirect message is sent on the host interface.

A.It will advertise the prefix to all other client peers and non-client peers.
B.It will not advertise the prefix to EBGP peers.
C.It will only advertise the prefix to all other IBGP peers.
D.It will not advertise the prefix to any peers.

A. loop guard
B. PortFast
C. root guard
D. BDPU guard

A.Prepend extra AS hops to the BGP prefix.
B.Advertise more specific BGP prefixes （longer mask）.
C.Add （prepend） one or more communities to the prefix that is advertised by BGP.
D.Have BGP dampen the prefix.

A.On/On
B.On/Auto
C.Passive/Active
D.Desirable/Auto
E.Active/Active
F.Desirable/Desirable