最新的CCNA認證 640-822考試題庫

問題1

Which protocol provides best-effort delivery of user data in a network?

A. IP

B. TCP

C. ARP

D. SMTP

E. MAC

正確答案: A

問題2

When files are transferred between a host and an FTP server, the data is divided into smaller pieces for transmission. As these pieces arrive at the destination host, they must be reassembled to reconstruct the original file. What provides for the reassembly of these pieces into the correct order?

A. the acknowledgement number in the segment header

B. the sequence number in the TCP header

C. the Start Frame Delimiter in the 802.3 Preamble

D. the frame check sequence in the Ethernet frame trailer

E. the TTL in the IP header

正確答案: B

問題3

Which statement describes the HDLC protocol?

A. It is the preferred protocol for LAN communication.

B. The Cisco implementation of HDLC does not include proprietary extensions.

C. HDLC is compatible between all network vendors.

D. On Cisco routers it is the default encapsulation for serial interfaces.

E. HDLC utilizes sophisticated flow control mechanisms to ensure reliable data transfer.

正確答案: D

問題4

HOTSPOT

正確答案:

問題5

Which commands display information about the Cisco IOS software version currently running on a router? (Choose three.)

A. show stacks

B. show protocols

C. show running-config

D. show version

E. show flash

F. show IOS

正確答案: C,D,E

問題6

Refer to the exhibits labeled A through E.

All devices are to be connected over Ethernet. Which three device-to-device configurations are likely to require the use of a crossover connection? (Choose three.)

A. exhibit D

B. exhibit E

C. exhibit C

D. exhibit A

E. exhibit B

正確答案: A,B,D

問題7

HOTSPOT
Click on the correct location or locations in the exhibit.

正確答案:

Explanation:
Router1(conf)# interface s0/0 Router1(conf-if)# no shutdown
User the "show ip interface brief" command

From the output, we learn that the status of Serial0/0 interface which connects to ISP router is currently "administratively down". This status indicates this interface is shutting down so we need to turn it on.

問題8

Which of the following are characteristics of a Frame Relay point-to-point subinterface? (Choose two.)

A. maps one IP subnet across multiple DLCIs

B. requires use of Inverse ARP

C. resolves NBMA split horizon issues

D. requires the frame-relay map command

E. maps one IP subnet per DLCI

正確答案: C,E

問題9

Which statement is true for DSL?

A. DSL is backward-compatible with analog voice.

B. Very-high-data-rate DSL is an example of SDSL.

C. DSL transmission occurs within a frequency range of 330 Hz and 3.3 kHz.

D. The DSLAM is installed at the customer site.

正確答案: A

問題10

Which of the following are types of flow control? (Choose three.)

A. windowing

B. load balancing

C. cut-through

D. congestion avoidance

E. buffering

正確答案: A,D,E

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