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单选题
When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （）
A
Layer 2 TTL
B
Layer 3 TTL
C
Layer 3 source address
D
Layer 3 transport protocol
E
Layer 3 destination address
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考题
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 routers 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 routers 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
考题
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．modemsB．routersC．switchesD．computers
考题
When an IP packet is Layer 3－switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? ()
A. Layer 2 TTLB. Layer 3 TTLC. Layer 3 source addressD. Layer 3 transport protocolE. Layer 3 destination address
考题
The following configuration line was added to router R1 Access－list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration?()
A.ermit all packet smatching the first three octets of the source address to all destinationsB.permit all packet matching the last octet of the destination address and accept all source addressesC.permit all packet matching the host bits in the source address to all destinationsD.permit all packet from the third subnet of the network address to all destinations
考题
Typically, an IP address refers to an individual host on a particular network. IP also accommodates addresses that refer to a group of hosts on one or more networks. Such addresses are referred to as multicast addresses, and the act of sending a packet from a source to the members of a （1）group is referred to as multicasting. Multicasting done （2）the scope of a single LAN segment is straightforward. IEEE 802 and other LAN protocols include provision for MAC-level multicast addresses. A packet with a multicast address is transmitted on a LAN Segment. Those stations that are members of the （3）multicast group recognize the multicast address and （4）the packet. In this case, only a single copy of the packet is ever transmitted. This technique works because of the （5）nature of a LAN: A transmission from any one station is received by all other station on the LAN.
空白（5）应选（ ）。
A. Multicast
B. unicast
C. broadcast
D. multiple unicast
考题
Typically，an IP address refers to an individual host on a particular network. IP also accommodates addresses that refer to a group of hosts on one or more networks.Such addresses are referred to as multicast addresses，and the act of sending a packet from a source to the members of a （71）group is referred to as multicasting. Multicasting done （72） the scope of a single LAN segment is straight forward. IEEE 802 and other LAN protocols include provision for MAC-level multicast addresses. A packet with a multicast address is transmitted on a LAN segment.Those stations that are members of the （73）multicast group recognize the multicast address and （74）the packet.In this case,only a single copy of the packet is ever transmitted.This technique works because of the （本题）nature of a LAN:A transmission from any one station is received by all other stations on the LAN.
A .multicast
B. unicast
C.broadcast
D.multiple unicast
考题
Traditional IP packet forwarding analyzes the（ ）IP address contained in the network layer header of each packet as the packet travels from its source to its final destination.A router analyzes the destination IP address independently at each hop in the network.Dynamic（ ）protocols or static configuration builds the database needed to analyze the destination IP address（the routing table）.The process of implementing traditional IP routing also is called hop-by-hop destination-based（ ）routing.Although successful，and obviously widely deployed，certain restrictions，which have been realized for some time，exist for this method of packet forwarding that diminish is（请作答此空）.New techniques are therefore required to address and expand the functionality of an IP-based network infrastructure.This first chapter concentrates on identifying these restrictions and presents a new archiecture，known as multiprotocol（ ）switching，that provides solutions some of these restrictions.
A.reliability
B.flexibility
C.stability
D.capability
考题
What is the best description of serialization delay？ （）A、the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interfaceB、the time it takes for a propagate from source to destinationC、the time it takes to place a frame on the physical medium for transportD、the time a packet resides in the outbound queue of a router
考题
What is the purpose using the traceroute command?（）A、to map all the devices on a network.B、to display the current TCP/IP configuration values.C、to see how a device MAC address is mapped to its IP address.D、to see the path a packet will take when traveling to a specified destination.E、to display the MTU values for each router in a specified network path from source to a destination.
考题
When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）A、Layer 2 TTLB、Layer 3 TTLC、Layer 3 source addressD、Layer 3 transport protocolE、Layer 3 destination address
考题
How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）A、It will fragment the packet at Layer 2.B、It will fragment the packet at Layer 3.C、It will drop the packet and send an ICMPv6 message "packet too big" back to the source.D、It will drop the packet.
考题
Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）A、Layer 2 TTLB、Layer 3 TTLC、Layer 3 source addressD、Layer 3 destination address
考题
When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （）A、Layer 2 TTLB、Layer 3 TTLC、Layer 3 source addressD、Layer 3 transport protocolE、Layer 3 destination address
考题
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、destinationB、resourceC、packetD、source
考题
Which two statements are correct when you use the reject parameter as the next-hop value for a static route?（）A、The packet is dropped and the packet's source is marked with the no-readvertise parameter.B、The system sends the packet back to the source.C、The packet is dropped from the network.D、The system sends an ICMP message back to the source of the packet.
考题
Which statement describes the behavior of source NAT with address shifting？（）A、Source NAT with address shifting translates both the source IP address and the source port of a packet.B、Source NAT with address shifting defines a one-to-one mapping from an original source IP address to a translated source IP address.C、Source NAT with address shifting can translate multiple source IP addresses to the same translated IP address.D、Source NAT with address shifting allows inbound connections to be initiated to the static source pool IP addresses.
考题
As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）A、The data is moving from 10BASE-TX to 100BASE-TX.B、The WAN encapsulation type has changed.C、The data format has changed from analog to digital.D、The source and destination hosts are in the same subnet.E、The source and destination MAC addresses have changed.
考题
The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.0 0.0.0.255 any What is the effect of this access list configuration?（）A、permit all packets matching the first three octets of the source address to all destinationsB、permit all packet matching the last octet of the destination address and accept all source addressesC、permit all packet matching the host bits in the source address to all destinationsD、permit all packet from the third subnet of the network address to all destinations
考题
For IKE phase 1 negotiations， when is aggressive mode typically used？（）A、when one of the tunnel peers has a dynamic IP addressB、when one of the tunnel peers wants to force main mode to be usedC、when fragmentation of the IKE packet is required between the two peersD、when one of the tunnel peers wants to specify a different phase 1 proposal
考题
多选题Which two statements are correct when you use the reject parameter as the next-hop value for a static route?（）AThe packet is dropped and the packet's source is marked with the no-readvertise parameter.BThe system sends the packet back to the source.CThe packet is dropped from the network.DThe system sends an ICMP message back to the source of the packet.
考题
单选题How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）A
It will fragment the packet at Layer 2.B
It will fragment the packet at Layer 3.C
It will drop the packet and send an ICMPv6 message packet too big back to the source.D
It will drop the packet.
考题
单选题The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration?（）A
ermit all packet smatching the first three octets of the source address to all destinationsB
permit all packet matching the last octet of the destination address and accept all source addressesC
permit all packet matching the host bits in the source address to all destinationsD
permit all packet from the third subnet of the network address to all destinations
考题
单选题The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration？（）A
ermit all packets matching the first three octets of the source address to all destinationsB
permit all packet matching the last octet of the destination address and accept all source addressesC
permit all packet matching the host bits in the source address to all destinationsD
permit all packet from the third subnet of the network address to all destinations
考题
单选题When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）A
Layer 2 TTLB
Layer 3 TTLC
Layer 3 source addressD
Layer 3 transport protocolE
Layer 3 destination address
考题
单选题Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）A
Layer 2 TTLB
Layer 3 TTLC
Layer 3 source addressD
Layer 3 destination address
考题
单选题Which statement describes the behavior of source NAT with address shifting？（）A
Source NAT with address shifting translates both the source IP address and the source port of a packet.B
Source NAT with address shifting defines a one-to-one mapping from an original source IP address to a translated source IP address.C
Source NAT with address shifting can translate multiple source IP addresses to the same translated IP address.D
Source NAT with address shifting allows inbound connections to be initiated to the static source pool IP addresses.
考题
单选题What is the best description of serialization delay？ （）A
the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interfaceB
the time it takes for a propagate from source to destinationC
the time it takes to place a frame on the physical medium for transportD
the time a packet resides in the outbound queue of a router
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