4A0-100 Free Practice Test

Kahn solved the problem of interconnecting different networks using different protocols by pioneering a new protocol called TCP that was capable of:

1. A. Secure transmission of informatio
2. B. Enforcing a constant packet size to avoid discard
3. C. Allowing remote login
4. D. Providing host to host connectivity with global addressin

Correct Answer: D

Host A is transmitting data to host B on a TCP connection. What is the purpose of the ACK sent by host B?

1. A. The ACK tells the host A that host B wishes to establish a sessio
2. B. The ACK tells host A the sequence number of the segment that was just received by host
3. C. The ACK tells host A the sequence number of the next segment that host B expects to se
4. D. The ACK is flow control from host B and tells host A to reduce its transmission rat

Correct Answer: C

What problem was Spanning Tree Protocol (STP) primarily designed to solve?

1. A. Inability to perform switch to switch redundancy using multiple connections at Layer 2.
2. B. Missing protocol field in Ethernet II required to identify redundancy protocols at Layer 2.
3. C. Missing packet sequencing in Layer 2 Ethernet required to re-order packets on arriva
4. D. Inability to forward multicast frames without a routing protoco

Correct Answer: A

Which of the parameters in Hello messages exchanged between two OSPF neighbors must be the same to keep the adjacency alive in OSPF? (Choose four.)

1. A. Interface MT
2. B. Area I
3. C. Authentication passwor
4. D. Hello interva
5. E. Dead interva
6. F. Router priorit

Correct Answer: BCDE

How does a VPRN service avoid the problem of overlapping IP addresses from different customers?

1. A. You cannot have overlapping IP addresse
2. B. Customers must change their IP address assignmen
3. C. Each VPRN service maintains a separate VPN routing and forwarding instance to separate customer routing informatio
4. D. This allows for overlapping addresse
5. E. A VPRN ignores IP addressing information and uses MAC addressing instead, which are always uniqu
6. F. A VPRN translates customer IP addresses to a private addressing scheme administered by the service provide

Correct Answer: B