[单项选择]A router that takes the workstations internal IP address and changes it to another IP address whenit sends the data outside of the network is an example of which of the following?（）
A. NAT
B. IDS
C. NMAP
D. DMZ

[单项选择] Router B1, an internal router in area 1, displays the following output. The only two ABRs connected to area 1 are performing Type 3 LSA filterinG. Which of the following answers is true based on the information in the output from B1?（） R1# show ip route 10.1.0.0 255.255.0.0 longer - prefixes ! Legend lines omitted for brevity 10.0.0.0/8 is variably subnetted, 17 subnets, 3 masks O 10.1.2.0/24 [110/658] via 10.10.13.1, 00:00:32, Serial0/0/0.1 O IA 10.1.1.0/24 [110/658] via 10.10.23.2, 00:41:39, Ser ial0/0/0.2 O IA 10.1.3.0/24 [110/658] via 10.10.23.2, 00:41:39, Serial0/0/0.2
A. A Type 3 LSA for 10.2.2.0/24 was filtered by both ABRs
B. A Type 3 LSA for 10.1.2.0/24 was not filtered by both ABRs
C. A Type 3 LSA for 10.1.3.0/24 was not filtered by  at least one ABR
D. A Type 3 LSA for 10.1.1.0/24 filtered by both ABRs

[单项选择]If an Ethernet port on router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet?（）
A. 1024
B. 2046
C. 4094
D. 4096
E. 8190

[单项选择]If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20,what is the maximum number of hosts allowed on this subnet?（）
A. 4094
B. 1024
C. 8190
D. 2046
E. 4096

[单项选择]If an ethernet port on a router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet（）。
A. 1024
B. 2046
C. 4094
D. 4096
E. 8190

[单项选择]Which statement about the ip classless router command is true?（）
A. The ip classless command is enabled by default in recent versions of IOS.
B. The ip classless command should only be enabled when static routing is being used instead of a routing protocol.
C. The ip classless command should be enabled by the network administrator whenever RIPv1 or IGRP is being used.
D. The ip classless command should be enabled by the network administrator whenever OSPF, RIPv2, or EIGRP is being used.

[单项选择] The following output occurs on Router R1. IP SLA operation 1 uses an ICMP echo operation type, with default frequency of 60 seconds. The operation pings from address 1.1.1.1 to address 2.2.2.2. Which of the following answers is true reg arding IP SLA and object tracking on R1?（） R1# show track Track 2 IP SLA 1 state State is Up 3 changes, last change 00:00:03 Delay up 45 secs, down 55 secs Latest operation return code: OK Latest RTT (millisecs) 6 Tracked by: STATIC - IP - ROUTING 0
A. The tracking return code fails after the SLA operation results in an ICMP echo failure three times.
B. The tracking return code fails after the SLA operation results in an ICMP echo failure one time.
C. After the tracking object fails, the tracking o bject moves back to an up state 45 seconds later in all cases.
D. After moving to a down state, the tracking object moves back to an OK state 45 seconds after the SLA operation moves to an OK state.

[单项选择]Every host and router on the Internet has an IP address, which encodes its
A. host number
B. host number and socket
C. network number
D. host number and network number

[单项选择]Every host and router on the Intemet has an IP address, which encodes its
A. host number
B. host number and socket
C. network number
D. host number and network number

[单项选择] The output of s how ip eigrp topology on Router R1 shows the following output, which is all the output related to subnet 10.11.1.0/24. How many feasible successor routes does R1 have for 10.11.1.0/24?（） P 10.11.1.0/24, 2 successors, FD is 2172419 via 10.1.1.2 (2172423/2 8167), Serial0/0/0.1 via 10.1.1.6 (2172423/28167), Serial0/0/0.2
A. 0
B. 1
C. 2
D. 3

[单项选择]IS-IS报文中IP Internal Reachabilit Information CLV的作用是（）。
A. 携带IS的区域号
B. 携带IS的Stem-ID信息
C. 携带使能IS-IS接口的IP地址信息
D. 携带IP前缀信息，即IP路由信息

[单项选择] Router R1, a branch router, connects to the Internet using DSL. The engineer plans to use a configuration with a dialer interface. The answers list a feature and interface on which the feature could be configured. Which combinations accurately describe the interface under which a feature will be configured?（）
A. PPP on the ATM interface
B. VPI/VCI on the dialer interface
C. IP address on the ATM interface
D. CHAP on the dialer interface

[判断题]路由器的Router ID 一定要与路由器的某一接口的IP 地址相同，通常会使用Loopback 接口的地址。

[单项选择] A small office in which all workstations are using an ISP provided IP range has noticed a consistent decrease in network traffic speed. The decrease does not occur when the gateway to the ISP is disconnected. Which of the following should the administrator implement?（）
A. Multicast addressing
B. Load balancing
C. Address translation
D. DHCP

[单项选择]You have a Level 1-only router (Router A) in IS-IS area 49.0001. How does Router A learn how to get to IP prefixes in other areas?（）
A. Router A must have a Level 2 adjacency with the Level 1/Level 2 router in area 49.0001.
B. The Level 1/Level 2 router in area 49.0001 sets the "attached" bit in the Level 1 link-state PDU (LSP) it floods into area 49.0001.
C. The Level 1/Level 2 router in area 49.0001 sets the "attached" bit in the Level 2 LSP it floods into area 49.0001.
D. The Level 1/Level 2 router in area 49.0001 advertises these prefixes into area 49.0001 using a Level 2 LSP it floods into the area.