CCNA v5 Routing & Switching Questions

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A router has two Fast Ethernet interfaces and needs to connect to four VLANs in the local network. How can you accomplish this task, using the fewest physical interfaces and without decreasing network performance?

10 points

Use a hub to connect the four VLANS with a Fast Ethernet interface on the router.

Add a second router to handle the VLAN traffic.

Add two more Fast Ethernet interfaces.

Implement a router-on-a-stick configuration.

For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)

10 points

to uniquely identify devices at Layer 2

to allow communication with devices on a different network

to differentiate a Layer 2 frame from a Layer 3 packet

to establish a priority system to determine which device gets to transmit first

to allow communication between different devices on the same network

to allow detection of a remote device when its physical address is unknown

In an Ethernet network, under what two scenarios can devices transmit? (Choose two.)

10 points

when they receive a special token

when there is a carrier

when they detect no other devices are sending

when the medium is idle

when the server grants access

Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?

10 points

transport

network

presentation

session

application

Which of the following describes the roles of devices in a WAN? (Choose three.)

10 points

A CSU/DSU terminates a digital local loop.

A modem terminates a digital local loop.

A CSU/DSU terminates an analog local loop.

A modem terminates an analog local loop.

A router is commonly considered a DTE device.

A router is commonly considered a DCE device.

A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port?

10 points

This is a 10 Mb/s switch port.

This is a 100 Mb/s switch port.

This is an Ethernet port operating at half duplex.

This is an Ethernet port operating at full duplex.

This is a port on a network interface card in a PC.

A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen?

10 points

session

transport

network

data link

physical

Where does routing occur within the DoD TCP/IP reference model?

10 points

application

internet

network

transport

Which of the following correctly describe steps in the OSI data encapsulation process?(Choose two.)

10 points

The transport layer divides a data stream into segments and may add reliability and flow control information.

The data link layer adds physical source and destination addresses and an FCS to the segment.

Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information

Packets are created when the network layer adds Layer 3 addresses and control information to a segment.

The presentation layer translates bits into voltages for transmission across the physical link.

What is the difference between a CSU/DSU and a modem?

10 points

CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.

A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.

A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.

A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.

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