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思科认证考试（ＣＣＮＡ）考试模拟题２０—３９及答案(1) |
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| 思科认证考试（ＣＣＮＡ）考试模拟题２０—３９及答案(1) |
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作者：佚名 文章来源：不详更新时间：2006-5-30 8:37:47  |
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Questions
20. [TxNx] If Host A sends a packet to Host B over token ring, and Host B is not active:
a) The packet will time out.
b) The packet will be removed by Host A.
c) The NVRAM of Host B will remove the packet.
d) The packet will "die" when it reaches the terminator.
e) The packet will be removed by the token monitor.
21. [TxNx] If Host A sends a packet to Host B over token ring: Host A dies after transmitting, and Host B is not active:
a) The packet will time out.
b) The packet will be removed by Host A.
c) The NVRAM of Host B will remove the packet.
d) The packet will "die" when it reaches the terminator.
e) The packet will be removed by the Active monitor.
22. [FxNx] BECN and FECN are:
a) Used to provide keepalives in a Frame Relay environment
b) Used to provide error checking in a Frame Relay environment
c) Used to provide congestion information in a Frame Relay environment
d) Used to provide flow control parameters in a Frame Relay environment
e) BECN and FECN are not used in a Frame Relay environment.
23. [RxNx] Which of the following are benefits of a Link-State routing protocol? (Choose all that apply.)
a) Allows the use of a more robust addressing scheme.
b) Allows for a larger scalable network
c) Reduces convergence time
d) Allows "supernetting"
e) All of the above.
24. [OxNx] Which of the following are reasons for the OSI model?
a) Standardizes interfaces
b) Allows modular engineering
c) Facilitates learning and teaching
d) All of the above.
25. [RxNx] Which of the following is NOT a ROUTING protocol:
a) OSPF
b) RIP
c) IPX
d) EIGRP
e) NLSP
26. [RxNx] Which statement is NOT true about link state protocols:
a) Link state advertisements are sent to all routers in an area.
b) Each router executes the SPF algorithm.
c) Link state routers keep a topological database of the network.
d) Link state routers include the originating router s routing table.
e) Link state routers know of possible alternate paths to a particular network.
27. [RxNx] Which of the following would NOT appear in a routing table?
a) Next hop address
b) Interface Port references
c) MAC address
d) Network address
e) Metrics
28. [OxNx] Which statement is true of the Datalink OSI layer ?
a) 802.3 is the MAC sub layer.
共8页: 1 [2] [3] [4] [5] [6] [7] [8] 下一页
b) No such thing
c) MAC sublayer provides the connection to the network layer.
d) MAC sublayer uses SAPS to access the network layer.
e) SAP sublayer uses the MAC layer to access the LAN medium.
29. [RINx] Given the IP address of 193.243.12.43 and a subnet mask of 255.255.255.128, what is the subnet address?
a) 194.243.12.32
b) 193.243.0.0
c) 194.243.12.43
d) 193.243.12.128
e) None of the above.
30. [CxNx] Cisco uses a naming convention to identify frame types. Which four of the following mappings are correct?
Cisco_name = Common_name
a) cisco_II = Ethernet_II
b) arpa = Ethernet_II
c) sap = Ethernet_802.3
d) sap = Ethernet_802.2 LLC
e) Novell Ether = Ethernet_802.2 LLC
f) cisco_802 = Ethernet_802.2 LLC
g) snap = Token Ring Snap
h) snap = Ethernet_SNAP
31. [RxNx] In order to communicate throughout an internetwork, which of the following are required. Choose Two.
a) The use of a routable protocol such as NetBEUI or LAT
b) A hierarchical naming scheme server such as DNS
c) A host file at each communicating device
d) A two part network addressing scheme such as Network/Host
e) The use of a routable protocol such as IP or IPX
f) The use of a routable protocol such as TCP or IPX
32. [CxNx] What is the default route on an IP network? Choose one.
a) This is the route that will be chosen first by IP for delivery of a datagram.
b) The address of the nearest downstream neighbor in a Token ring network.
c) At the router, it is the route used to direct frames for which the next hop has not been explicitly listed in the routing table.
d) Any static route listing in a routing table.
e) When all conditions are equal, the best route for delivery of IP datagrams.
33. [CxNx] A caret symbol (^) inserted into a failed command indicates which of the following. Choose one.
a) Numeric data is required for this command.
b) The point in a command where you can simply press return to complete the syntax string.
c) The point in a command where you have entered an incorrect command, keyword or argument.
d) The point in a command where you must enter a required value.
e) This is a normal indicator for any failed command.
34. [RXNx] The metric used by IPX RIP is:
a) hops
b) ticks
c) cost
d) ticks and hops
e) None of the above.
35. [xINx] Which one of the
共8页: 上一页 [1] 2 [3] [4] [5] [6] [7] [8] 下一页
following masks has the nickname of the "serial mask"?
a) 255.255.255.192
b) 255.255.255.224
c) 255.255.255.240
d) 255.255.255.248
e) 255.255.255.252
36. [SxNx] The following statement would deny traffic from what subnets?
Router_B(config)#access-list 101 deny
tcp 10.1.8.0 0.0.7.255
192.16.5.0 0.0.0.255
a) 10.1.8.0
b) 10.1.15.0
c) 10.1.0.0
d) 10.1.16.0
e) choice a and b
37. [SxNx] Name three reasons why VLAN s should be created.
a) Moves, Adds and Changes are made simpler.
b) There is less administrative overhead.
c) The switch can route between VLANS.
d) It limits broadcasts domains.
e) The router can switch faster.
38. [SxNx] The Catalyst 5000 uses which switching mode?
a) Cut-through
b) Store and forward
c) Fast switching
d) Choice a and b
e) Choice a and c
39. [OxNx] Which of the following layers defines data representation?
a) Application Layer 7
b) Presentation Layer 6
c) Session Layer 5
d) Transport Layer 4
e) Network Layer 3
f) Data Link Layer 2
g) Physical Layer 1
CCNA试题20-39答案
20. [TxNx] If Host A sends a packet to Host B over token ring, and Host B is not active:
a) The packet will time out.
b) The packet will be removed by Host A.
c) The NVRAM of Host B will remove the packet.
d) The packet will "die" when it reaches the terminator.
e) The packet will be removed by the token monitor.
Answer
b) The packet will be removed by Host A.
21. [TxNx] If Host A sends a packet to Host B over token ring: Host A dies after transmitting, and Host B is not active:
a) The packet will time out.
b) The packet will be removed by Host A.
c) The NVRAM of Host B will remove the packet.
d) The packet will "die" when it reaches the terminator.
e) The packet will be removed by the Active monitor.
Answer
e) The packet will be removed by the Active monitor.
22. [FxNx] BECN and FECN are:
a) Used to provide keepalives in a Frame Relay environment
b) Used to provide error checking in a Frame Relay environment
c) Used to provide congestion information in a Frame Relay environment
d) Used to provide flow control parameters in a Frame Relay environment
e) BECN and FECN are not used in a Frame Relay environment.
Answer
c) Used to provide congestion information in a
共8页: 上一页 [1] [2] 3 [4] [5] [6] [7] [8] 下一页
Frame Relay environment
The following are definitions of each:
Backward Explicit Congestion Notification (BECN) - Bit set by a frame relay network in frames traveling in opposite direction of frames encountering a congested path. DTE receiving frames with the BECN bit set can request higher level protocols take flow control action.
Forward Explicit Congestion Notification (FECN) - Bit set by a frame relay network to inform DTE receiving frame that congestion was experienced in the path from source to destination.
23. [RxNx] Which of the following are benefits of a Link-State routing protocol? (Choose all that apply.)
a) Allows the use of a more robust addressing scheme.
b) Allows for a larger scalable network
c) Reduces convergence time
d) Allows "supernetting"
e) All of the above.
Answer
e) All of the above
24. [OxNx] Which of the following are reasons for the OSI model?
a) Standardizes interfaces
b) Allows modular engineering
c) Facilitates learning and teaching
d) All of the above.
Answer
d) All of the above
25. [RxNx] Which of the following is NOT a ROUTING protocol:
a) OSPF
b) RIP
c) IPX
d) EIGRP
e) NLSP.
Answer
c) IPX
There are routing protocols and routed protocols. Some examples of routed protocols include IP, IPX, Appletalk and Decnet. A routed protocol travels through the network. Routing protocols such as OSPF, IP RIP, IPX RIP, IGRP and EIGRP represent the language that routers use to determine the best path through the network.
26. [RxNx] Which statement is NOT true about link state protocols:
a) Link state advertisements are sent to all routers in an area.
b) Each router executes the SPF algorithm.
c) Link state routers keep a topological database of the network.
d) Link state routers include the originating router s routing table.
e) Link state routers know of possible alternate paths to a particular network.
Answer
d) Link state routers include the originating router s routing table.
Choice d is not true because dur[1] [2] [3] 下一页
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