CCENT Practice Certification Exam # 2.pdf

CCENT Practice Certification Exam # 2 - CCNA Exploration: Accessing the WAN (Version 4.0)

1. Data is being sent from a source PC to a destination server. Which three statements correctly describe the function of TCP or UDP in this situation? (Choose three.)

The UDP destination port number identifies the application or service on the server which will handle the data.

TCP is the preferred protocol when a function requires lower network overhead.

UDP segments are encapsulated within IP packets for transport across the network.

The source port field identifies the running application or service that will handle data returning to the PC.

The TCP source port number identifies the sending host on the network.

The TCP process running on the PC randomly selects the destination port when establishing a session with the server.

2. In what two situations would UDP be the preferred transport protocol over TCP? (Choose two.)

when applications need to guarantee that a packet arrives intact, in sequence, and unduplicated

when a faster delivery mechanism is needed

when delivery overhead is not an issue

when applications do not need to guarantee delivery of the data

when destination port numbers are dynamic

3. Refer to the exhibit. Workstation A sends an IP packet to workstation B. Which two statements describe the encapsulation of the packet as it passes through the network?

The Layer 2 header is stripped from the packet by each router.

The destination Layer 2 address of the packet does not change.

The source Layer 3 address of the packet changes at each router.

The Layer 2 header changes at each router.

The Layer 3 header is stripped from the packet by each router.

4. Refer to the exhibit. A switch with a default configuration connects four hosts. The ARP table for host A is shown. What happens when host A wants to send an IP packet to

host D?

Host A sends an ARP request to the MAC address of host D.

Host D sends an ARP request to host A.

Host A sends out the packet to the switch. The switch sends the packet only to the host D, which in turn responds.

Host A sends out a broadcast of FF:FF:FF:FF:FF:FF. Every other host connected to the switch receives the broadcast and host D responds with its MAC

address.

5. What three services are provided by the transport layer? (Choose three.)

flow control

encryption of data

path determination

connection establishment

error recovery

bit transmission

data representation

6. Which layer of the OSI model handles the process of identifying and discarding damaged frames?

presentation

session

transport

network

data link

physical

7. Refer to the exhibit. Considering the information that follows and the exhibit, where is the data flowing?

Source IP address: 192.168.1.88

Destination IP address: 209.165.200.225

Source MAC address: 00-11-12-7a-41-10

Destination MAC address: 00-0d-cc-f4-ad-2c

Source Port: 1464

Destination Port: 23

A – from laptop to access point

B – from access point to attached switch

C – from host to default gateway router

D – from router to ISP

8. Refer to the exhibit. If Host 1 needs to request its IP address from the server, what protocol would be used to process that request?

CSMA/CD

CSMA/CA

DHCP

ICMP

NAT

FTP

9. Refer to the exhibit. If Host 1 were to transfer a file to the server, what layers of the TCP/IP model would be used?

only application and Internet layers

only Internet and network access layers

only application, Internet, and network access layers

application, transport, Internet, and network access layers

only application, transport, network, data link, and physical layers

application, session, transport, network, data link, and physical layers

10. ABC company needs to connect its router to an ISP to access the Internet. What device is needed to connect the router to the ISP if the ISP supplies a T1 leased line for the

connection?

CSU/DSU

modem

DSL router

NT1 device

ISDN modem

11. Refer to the exhibit. How many collision domains exist in the exhibited network?

12. What are two actions performed by a Cisco switch? (Choose two.)

building a routing table that is based on the first IP address in the frame header

using the source MAC addresses of frames to build and maintain a MAC address table

forwarding frames with unknown destination IP addresses to the default gateway

utilizing the MAC address table to forward frames via the destination MAC address

examining the destination MAC address to add new entries to the MAC address table

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