[单项选择]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 TTL
B. Layer 3 TTL
C. Layer 3 source address
D. Layer 3 destination address

[单项选择]（）sent from Florida for all the children in Cabin Six.
A. A crate of orange were
B. A crate of oranges were
C. A crate of orange was
D. A crate of oranges was

[单项选择]When a packet is sent from Host 1 to Server 1, in how many different frames will the packet be encapsulated as it is sent across the internetwork（）。
A. 0
B. 1
C. 2
D. 3
E. 4

[单项选择]He sent（）from Canada.
A. her a card
B. to her a card
C. card to her
D. to her card

[单项选择]Which configuration command controls the source IP address for packets sent to a RADIUS server？（）
A. radius override nas-ip-addr
B. radius source-ip-address 10.13.7.55
C. radius update-source-address 10.13.7.11
D. radius authentication server 10.13.7.55

[单项选择]利用IP数据包中的一个选项IP Source Routing来指定路由，利用可信用户对服务器进行攻击，这种攻击是（）
A. 源路由选择欺骗（Source Routing Spoofing ）
B. IP欺骗（IP Spoofing）
C. DNS欺骗（DNS Spoofing）.
D. TCP序列号欺骗

[单项选择]The underlined phrase "emanate from" in (Sent. 2, Para. 1) most probably means " ______ ".
A. thrive on
B. account for
C. originate from
D. descend from

[单项选择] Examine the following excerpt from the show ip ospf database asbr -summary command on router R1 (RID 1.1.1.1). Which answer can be verified as definitely true based on this output?（） LS Type: Summary Links (AS Boundary Router) Link State ID: 9.9.9.9 (AS Boundary Router address) Advertising Router: 3.3.3.3 LS Seq Number: 8000000D Checksum: 0xE43A Length: 28 Network Mask: /0 TOS: 0 Metric: 100
A. The output describes the contents of a Type 5 LSA
B. 3.3.3.3 identifies a ro uter as being the router performing redistribution
C. R1's metric for its best route to reach the router with RID 9.9.9.9 is 100
D. The router with RID 3.3.3.3's metric for its best route to reach the router with RID 9.9.9.9 is 100

[单项选择] Examine the following excerpt from the show ip eigrp topology 10.2.2.0/24 command on router R1.Which answer can be verified as definitely true based on this output?（） External data: Originating router is 10.1.1.1 AS number of route is 1 External protocol is OSPF, external metric is 64 Administrator tag is 0 (0x00000000)
A. R1 is the router that redistributed the route
B. R1's metric to reach subnet 10.2.2.0/24 is 64
C. The route was redistributed on a router that has a router ospf 1 command configured
D. R1 is redistributing a route to prefix 1 0.2.2.0/24 into OSPF

[多项选择] The following output was taken from the show ip bgp command on Router R2. In this case, which of the following commands are most likely to already be configured on R2?（） BGP router identifier 11.11.11.11, local AS number 11 ... Neighbor V AS Ms gRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 1.1.1.1 4 1 87 87 0 0 0 00:00:06 Idle (Admin) 2.2.2.2 4 3 173 183 41 0 0 00:58:47
A. router bgp 11
B. neighbor 1.1.1.1 remote- as 11
C. neighbor 2.2.2.2 prefix - limit 1
D. neighbor 1.1.1.1 shutdown

[单项选择] The following output, taken from a show ip bgp command on Router R1, lists two neighbors. In what BGP neighbor state is neighbor 1.1.1.1?（） Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 1.1.1.1 4 1 60 61 26 0 0 00:45:01 0 2.2.2.2 4 3 153 159 26 0 0 00:38:13 1
A. Idle
B. Opensent
C. Active
D. Established

[单项选择]Which line from the output of the show ip interface command indicates a layer 1 problem?（）
A. Serial0/1 is up, line protocol is down
B. Serial0/1 is down, line protocol is down
C. Serial0/1 is up, line protocol is up
D. Serial0/1 is administratively down, line protocol is down

[多项选择]What can be determined from the line of show ip route output shown in the exhibit?（）
A. The next routing update can be expected in 35 seconds.
B. The IP address 10.10.10.6 is configured on S0/1.
C. The IP address 10.10.10.8 is configured on S0/1.
D. This route is using the default administrative distance.
E. The 10.10.10.8 network is two hops away from this router.

[多项选择]The TCP/IP network model differs from the more popular OSI model. Which of the layers below belong to the TCP/IP model?（）
A. application layer
B. session layer
C. transport layer
D. internet layer
E. network layer
F. data link layer
G. physical layer

[单项选择]How many usable IP addresses can you get from a conventional Class C address?（）
A. 128
B. 192
C. 254
D. 256
E. 510

[单项选择]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 TTL
B. Layer 3 TTL
C. Layer 3 source address
D. Layer 3 transport protocol
E. Layer 3 destination address

[名词解释]IP交换

[名词解释]IP地址