CCNA系列認(rèn)證CCNA(640-801)章節(jié)練習(xí)(2019.04.30)

單項選擇題
Which command is used to display the placement and direction of an IP access control list on a router?（）
A. show access-list
B. show ip route
C. show ip interface
D. show interface
E. show interface list
F. show ip interface brief
單項選擇題
Which switching mode provides the highest level of integrity and error-free transport, rather then maximizing speed?（）
A. 802.1q forwarding
B. VTP transparent mode
C. Cut-through
D. Store-and-forward
E. Fragment-free
F. Frame-filtering
多項選擇題
Which encapsulation types are configurable on a Cisco switch for a trunk?（）
A. VTP
B. ISL
C. CDP
D. 802.1Q
E. 802.1p
F. LLC
G. IETF
多項選擇題
What are the differences between full-duplex Ethernet and half-duplex Ethernet?（）
A. Half-duplex Ethernet operates in a shared collision domain.
B. Full-duplex Ethernet has a lower effective throughput.
C. Half-duplex Ethernet operates in a private collision domain.
D. Full-duplex Ethernet allows two-way communication.
E. Half-duplex Ethernet operates in a private broadcast domain.
多項選擇題
While working in setup mode, a configuration line is typed incorrectly. What should you do to exit setup mode, without executing or saving any of the mistakes you made?（）
A. Type exit at the setup dialog.
B. Type close at the setup dialog.
C. Press the Ctrl-C key combination.
D. Press the Ctrl-X key combination.
E. Issue the copy startup-config command.
F. Issue the 'write e" command.
G. Issue the "write mem" command
多項選擇題
On the serial interface of a router, an inbound access list is configured to deny all traffic from UDP and TCP ports 21, 23, and 25. All other traffic is permitted. Based on this information, which types of traffic will be allowed through this interface?（）
A.SMTP
B.DNS
C.FTP
D.Telnet
E.HTTP
F.POP3
多項選擇題
What are two characteristics of "store and forward" switching?（）
A. Latency fluctuates regardless of frame size.
B. The switch receives the complete frame before beginning to forward it.
C. Latency through the switch varies with frame length.
D. The switch checks the destination address upon receipt of headers.
單項選擇題
A TestKing PC has the IP address 172.16.209.10 /22. What is the subnet of this address?（）
A.172.16.42.0
B.172.16.107.0
C.172.16.208.0
D.172.16.252.0
E.172.16.254.0
單項選擇題
Which of the following statements regarding the use of multiple access lists are valid when configuring a single interface on a Cisco router?（）
A. Application of up to three access lists per protocol to a single interface.
B. No more than two access lists per interface.
C. One access list may be configured per direction for each Layer 3 protocol configured on an interface.
D. The maximum number allowed varies due to RAM availability in the router.
E. An infinite number of access lists that can be applied to an interface, from most specific to most general.
F. Cisco IOS allows only one access list to an interface.
單項選擇題
A TestKing.com technician is troubleshooting connectivity problems between two routers that are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the show cdp neighbors command.In which OSI layer is the problem most likely occurring?（）
A. Physical
B. Data link
C. Network layer
D. Transport layer
E. Application layer

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