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最新的 CCNA 640-822 免費考試真題:

1. What is the purpose of flow control?

A) to regulate the size of each segment
B) to ensure data is retransmitted if an acknowledgment is not received
C) to provide a means for the receiver to govern the amount of data sent by the sender
D) to reassemble segments in the correct order at the destination device

2. Refer to the exhibit.

The ports that are shown are the only active ports on the switch. The MAC address table is shown in its entirety. The Ethernet frame that is shown arrives at the switch.
What two operations will the switch perform when it receives this frame? (Choose two.)

A) The frame will be forwarded out port fa0/3 only.
B) The frame will be forwarded out fa0/1, fa0/2, and fa0/3.
C) The MAC address of 0000.00aa.aaaa will be added to the MAC address table.
D) The MAC address of 0000.00dd.dddd will be added to the MAC address table.
E) The frame will be forwarded out all the active ports.

3. In the configuration of NAT, what does the keyword overload signify?

A) If the number of available IP addresses is exceeded, excess traffic will use the specified address pool.
B) When bandwidth is insufficient, some hosts will not be allowed to access network translation.
C) The pool of IP addresses has been exhausted.
D) Multiple internal hosts will use one IP address to access external network resources.

4. Refer to the exhibit. A user cannot reach any web sites on the Internet, but others in the department are not having a problem. What is the most likely cause of the problem?

A) A DHCP server address is not reachable by the PC.
B) A DNS server address is not reachable by the PC.
C) NAT has not been configured on the router that connects to the Internet.
D) The default gateway is not in the same subnet.
E) IP routing is not enabled.

5. If a host experiences intermittent issues that relate to congestion within a network while remaining connected, what could cause congestion on this LAN?

A) multicasting
B) network segmentation
C) broadcast storms
D) half-duplex operation

問題與答案：