Tuesday, February 5, 2008

CCNA 1 - Module 6 Exam Answers

Refer to the exhibit. Host A is communicating with host F. What happens to a frame sent fromhost A to host F as it travels over the Ethernet segments?
*The frame format remains the same across each Ethernet segment.

How many hexadecimal digits are in a MAC address?

What are three functions of a NIC in a PC? (Choose three.)
*A NIC connects the PC to the network media.
*A NIC detects collisions on the Ethernet segment.
*A NIC passes the contents of selected frames to the upper OSI layers.

At what layer of the OSI model does a MAC address reside?

A router has an Ethernet, Token Ring, serial, and ISDN interface. Which interfaces will have a MAC address
*Ethernet and Token Ring interfaces

In an Ethernet LAN, how does the NIC know when it can transmit data?
*An Ethernet NIC transmits data after listening for the absence of a signal on the media.

Which characteristics describe carrier sense multiple access collision detect (CSMA/CD)?(Choose three.)
*collision environment
*first-come, first-served approach

Which two devices can provide full-duplex Ethernet connections? (Choose two.)
*Layer 2 switch

On a local area network, one workstation can send data on the line while it is receiving data. What type of data transfer does this describe?
*full duplex

Refer to the exhibit. The small office network shown in the exhibit consists of fourcomputers connected through a hub. Which configuration would cause collisions and errors onthe network?
*administratively configured full duplex

Refer to the exhibit. The switch and workstation are administratively configured forfull-duplex operation. Which statement accurately reflects the operation of this link?
*No collisions will occur on this link.

Refer to the exhibit. All hosts are in listen mode. Host 1 and Host 4 both transmit data atthe same time. How do the hosts respond on the network? (Choose two.)
*After the end of the jam signal, Hosts 1, 2, 3, and 4 invoke a backoff algorithm.
*If a host has data to transmit after the backoff period of that host, the host checks to determine if the line is idle, before transmitting.

When a collision occurs in a network using CSMA/CD, how do hosts with data to transmitrespond after the backoff period has expired?
*The hosts return to a listen-before-transmit mode.

Which statement describes how CSMA/CD on an Ethernet segment manages the retransmission offrames after a collision occurs?
*The devices transmitting when the collision occurs DO NOT have priority for retransmission.

Refer to the exhibit. A technician wants to increase the available bandwidth for theworkstation by allowing the switch and the NIC on the workstation to transmit and receivesimultaneously. What will permit this?

Why do hosts on an Ethernet segment that experience a collision use a random delay beforeattempting to transmit a frame?
*A random delay helps prevent the stations from experiencing another collisionduring the transmission.

In which two layers of the OSI model does Ethernet function? (Choose two.)
*data link

Which of the following are specified by IEEE standards as sublayers of the OSI data linklayer? (Choose two.)
*Logical Link Control
*Media Access Control

Where does the MAC address originate?
*burned into ROM on the NIC card

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