思科认证考试（ＣＣＮＡ）考试模拟题２０—３９及答案(2)
添加时间: 2007-9-3 22:09:49 作者: Cisco认证考试 阅读次数:52 来源: http://www.d9soft.com
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 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 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.
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