IEEE802标准中， ______ 规定了LAN参考模型的体系结构。A．802.1AB．802.2C．802.1BD．802.3

A. Forward the packet.

B. Fragment the packet.

C. Drop the packet silently.

D. Drop the packet and send an ICMPv6 message.

a GRE and IPsec tunnel, over the DSL connection, destined for an Enterprise network.Which of the following answers best describes the router‘s logic that tells the router, for a given packet, to apply GRE encapsulation to the packet？（）

A. When the packet received on the LAN interface is permitted by the ACL listed on the tunnel greacl command under the incoming interface

B. When routing the packet, matching a route whose outgoing interface is the GRE tunnel interface

C. When routing the packet, matching a route whose outgoing interface is the IPsec tunnel interface

D. When permitted by an ACL that was referenced in the associated crypto map

An internet is a combination of networks connected by (1). When a datagram goes from a source to a？ (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a？ (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet？ The decision is based on optimization: Which of the available (5) is the optimum pathway？

空白（4）处应选择（）

A. destination

B. resource

C. packet

D. source

A.The IP address of sever 1.

B.The MAC address of NIC in sever 1.

C.The IP address of F0/0 interface of router R1.

D.The MAC address of the Fa0/0 interface of router R1.

E.The IP address of the s0/0/0 interface of router R2

F.The MAC address of the s0/0/0 interface of router R2

A. If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, it will

B. If the destination IP address in the outer IP header of ESP does not match the IP address of the ingress interface, it will

C. If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, based packet.

D. If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, based of inner header, it will decrypt the packet.

A. It performs a label pop operation and an IP lookup.

B. It performs a label swap operation and an IP lookup.

C. It sends an error message toward the egress router.

D. It sends an error message toward the ingress router.

An internet is a combination of networks connected by (71) .When a datagram goes from a source to a (72) ，it will probably pass many (73) until it reaches the router attached to the destination network．A router receives a (74) from a network and passes it to another network．A router is usually attached to several networks．When it receives a packet，to which network should it pass the packet？ The decision is based on optimization： Which of the available (75) is the optimum pathway？

A．modems

B．routers

C．switches

D．computers

An internet is a combination of networks connected by (71) .When a datagram goes from a source to a (72) ，it will probably pass many (73) until it reaches the router attached to the destination network．A router receives a (74) from a network and passes it to another network．A router is usually attached to several networks．When it receives a packet，to which network should it pass the packet？ The decision is based on optimization： Which of the available (75) is the optimum pathway？

A．modems

B．routers

C．switches

D．computers

A.The Mac address of the NIC in Sever1

B.The IP address of Server 1.

C.The MAC address of the s0/0/0 interface of router R2

D.The IP address of the s0/0/0 interface of router R1

E.The IP address of the Fa0/0 interface of router R1

An internet is a combination of networks connected by (1). When a datagram goes from a source to a？ (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a？ (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet？ The decision is based on optimization: Which of the available (5) is the optimum pathway？

空白（3）处应选择（）

A. destinations

B. routers

C. packets

D. computers