A router receives a packet on interface 172.16.45.66/26. The source IP of the packet is 172.16.45.127/26 and the destination is 172.16.46.191/26.How will the router handle the packet?（）A、The destination is a host on another subnet, so the router will not

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. 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.

阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the router’s network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the router’s routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.

A．is generating B．generate C．is generated D．generates A．forwarding table B．network interfaces C．routing policies D．destination address A．the destination address and network interfaces B．forwarding table and network interfaces C．the destination address and forward table D．routing policies and routing table

A.Router1 will strip off the source MAC address and replace it with the MAC address 0000.0c36.6965.

B.Router1 will strip off the source IP address and replace it with the IP address 192.168.40.1.

C.Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320.

D. Router1 will strip off the destination IP address and replace it with the IP address of 192.168.40.1.

E.Router1 will forward the data packet out interface FastEthernet0/1.

F.Router1 will forward the data packet out interface FastEthernet0/2.

A. permit all packets matching the first three octets of the source address to all destinations

B. permit all packet matching the last octet of the destination address and accept all source addresses

C. permit all packet matching the host bits in the source address to all destinations

D. permit all packet from the third subnet of the network address to all destinations

Router VE1 has just received a packet and needs to route it. What two actions must this router take in order to route incoming packets? (Choose two)

A. Inspect the routing table to select the best path to the destination network addresses.

B. Validate sources of routing information.

C. Inspect the ARP table to verify a legitimate source MAC address for each packet.

D. Identify the destination network address of each packet.

E. Verify the receipt of routed packets by the next hop router.

F. Identify the source network address of each packet.

A. The destination is a host on another subnet, so the router will not forward the packet.

B. The destination is a host on the same subnet, so the router will forward the packet.

C. The destination is a broadcast address, so the router will not forward the packet.

D. The destination is a network address, so the router will forward the packet.

● 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?

（71）

A. modems

B. routers

C. switches

D. computers

（72）

A. user

B. host

C. city

D. destination

（73）

A. destinations

B. routers

C. packets

D. computers

（74）

A. destination

B. resource

C. packet

D. source

（75）

A. pathways

B. routers

C. diagrams

D. calls

A.ermit all packet smatching the first three octets of the source address to all destinations

B.permit all packet matching the last octet of the destination address and accept all source addresses

C.permit all packet matching the host bits in the source address to all destinations

D.permit all packet from the third subnet of the network address to all destinations

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