201-250.txt

用jsp编的一个网络程序

Answer: A

226. What is the most common Layer 2 device?
A. Hub
B. Router
C. Switch
D. Repeater

Answer: C

227. Which statement should you use to deny FTP access only from Network 210.93.105.0 to Network
223.8.151.0?
A. Access-list one deny 210.93.105.0.0.0.0.0.0 any eq ftp access-list one permit any.
B. Access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftp
C. Access-list 100 deny ip 223.8.151.0 0.0.0.255 any eq ftp
Access-list 100 permit ip any any
D. Access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftp
Access-list 100 permit ip any any

Answer: D

228. Which network mask should you place on a class C address to accommodate a user requirement
of two sub networks with a maximum of 35 hosts on each network?
A. 255.255.255.192
B. 255.255.255.224
C. 255.255.255.240
D. 255.255.255.248

Answer: A

229. What are two purposes of segmenting a network with a bridge? (Choose two)
A. To reduce collisions.
B. To increase collisions.
C. To add collision domains.
D. To reduce collision domains.
E. To have more broadcast domains.

Answer: A C

230. What is an advantage of using a connectionless protocol such as UDP?
A. Packet acknowledgement may reduce overhead traffic.
B. Loss or duplication of data packets is less likely to occur.
C. Packets are not acknowledged which reduces overhead traffic.
D. The application relies on the transport layer for sequencing of the data packets.

Answer: C

231. Which statement is true when a broadcast is sent in an Ethernet/802.3 LAN?
A. The IP subnet used is 255.255.255.0
B. The IP address used is 255.255.255.255
C. The MAC address used is 00-00-00-00-00-00
D. The MAC address used is FF-FF-FF-FF-FF-FF.

Answer: D

232. What are two components of an IPX address?
A. Network number; IP address.
B. MAC address; node number.
C. Network number; MAC address.
D. Network number; subnet number.

Answer: C

233. Which two statements about integrated services digital network (ISDN) are true? (Choose two)
A. ISDN provides only data only capability.
B. ISDN provides an integrated voice/data capability.
C. The ISDN standards define the hardware and call setup schemes for end-to-end digital connectivity.
D. Users receive more bandwidth on WANs with a leased line of 56kbps than with multiple b channels.

Answer: B C

234. Which command must be entered when connecting two routers without external DCE devices via
a serial link?
A. serial up
B. line protocol up
C. clock rate
D. dce rate
E. dte rate

Answer: C

235. Which of the following devices operate at Layer 2 of the OSI model? (Choose two)
A. router
B. SMTP server
C. Transceiver
D. Switch
E. Bridge
F. Hub

Answer: D E

236. Which command correctly configures an IP address on a Cisco router interface?
A. router(config-if) #ip address 172.18.32.1 subnet mask 255.255.252.0
B. router(config-if) #172.18.32.1 255.255.252.0
C. router(config-if) #ip address 172.18.32.1 255.255.252.0
D. router(config-if) #172.18.32.1 subnet mask 255.255.252.0
E. router(config-if) #ip address 172.18.32.1/22
F. router(config-if) #ip address 172.18.32.1 subnet mask /22

Answer: C

237. Which device can be used to segment broadcast domains?
A. hub
B. router
C. bridge
D. repeater

Answer: B

238. Which layer in the TCP/IP model corresponds to the OSI Network layer?
A. Application
B. Transport
C. Internet
D. Network
E. Physical

Answer: C

239. Which of the following is a subnet broadcast address for network 201.57.78.0/27?
A. 201.57.78.33
B. 201.57.78.64
C. 201.57.78.87
D. 201.57.78.97
E. 201.57.78.159
F. 201.57.78.254

Answer: E

240. Which command sends and receives ICMP echo messages to verity connectivity from host to
host?
A. ping
B. tracert
C. netstat
D. show cdp neighbors detail
E. show ip route
F. traceroute

Answer: A

241. Calculate the number of usable network and host addresses for 213.105.72.0/28.
A. 62 networks and 2 hosts
B. 6 networks and 30 hosts
C. 8 networks and 32 hosts
D. 16 networks and 16 hosts
E. 14 networks and 14 hosts

Answer: E

242. Which of the following is true concerning Frame Relay multipoint subinterfaces?
A. An IP address is required on the physical interface of the central router
B. All routers are required to be fully meshed
C. All routers must be in the same subnet to forward routing updates and broadcasts.
D. Multipoint is the default configuration for Frame Relay subinterfaces.

Answer: C

243. After configuring your router, you are unable to ping the directly connected serial port of the
neighboring router. The show running-config output displays the word “shutdown” for the serial
interface. Which of the following lines will be displayed in the show interface s0 output?
A. Serial 0 is up, line protocol is down
B. Serial 0 is down, line protocol is down
C. Serial 0 is down, line protocol is up
D. Serial 0 is administratively down, line protocol is down
E. Serial 0 is administratively down, line protocol is up
F. Serial 0 is administratively up, line protocol is down

Answer: D

244. Company ABC has just added an employee workstation to its network. The employee is unable to
connect to the server at IP address 192.168.10.98 /27. Identify the incorrectly configured network
parameter.
A. workstation IP address
B. workstation subnet mask
C. workstation default gateway
D. router interface E0 IP address

Answer: C

245. What is the purpose of DLCIs in Frame Relay?
A. They determine the Frame Relay encapsulation type.
B. They identify the logical circuit between a local router and a Frame relay WAN switch.
C. They represent the keepalives used to maintain the PVC in an active state.
D. They represent the physical address of the router attached to a Frame Relay network.

Answer: B

246. What function does the up arrow key provide within the Cisco router IOS?
A. recalls the previous command line
B. moves the cursor one line up
C. redisplays the current command line
D. capitalizes the command line

Answer: A

247. Hosts in the sales department are unable to access a new server at the Remote Office. Consider
the IP addressing scheme in the accompanying graphic to determine the problem.
A. The default gateway of the workstations in the sales department is incorrect.
B. The subnet mask of the workstations in the sales department is incorrect.
C. The default gateway of the server at the Remote Office is incorrect.
D. The host address of the server at the Remote Office is invalid.
E. The serial 0 interface on the Home Office router and the serial 1 interface on the Remote Office
router are not on the same subnetwork.

Answer: D

248. Which of the following statements are true regarding full-duplex Ethernet when compared to
half-duplex Ethernet? (Choose two.)
A. Full-duplex Ethernet consists of a shared broadcast domain, while half-duplex Ethernet consists of
a private broadcast domain.
B. Full-duplex Ethernet is collision free, while half-duplex Ethernet is subject to collisions.
C. Full-duplex Ethernet provides higher throughput than half-duplex Ethernet of the same bandwidth.
D. Full-duplex Ethernet provides lower throughout than half-duplex Ethernet of the same bandwidth.
E. Full-duplex Ethernet consists of a shared cable segment, while half-duplex Ethernet provides a
point-to-point link.

Answer: B C

249. Based on the debug output shown, what type of handshake occurred for PPP authentication?
A. one-way
B. two-way
C. three-way
D. no handshakes required during authentication

Answer: C

250. You have configured a new Frame Relay link on a router that is using IGRP. Which command
would you use to set the IGRP metric for the speed of this link?
A. Router(config)# IGRP metric 256K
B. Router(config)# bandwidth 256
C. Router(config-if)# metric 256K
D. Router(config-if)# bandwidth 256

Answer: D