Computer Networking
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.

All of these
3, 3, 2, none
3, 3, 1, 7
3, 2, 1, 7
3, 2, 1, none

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Computer Networking
How does a host on an Ethernet LAN know when to transmit after a collision has occurred?1. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.2. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.3. You can improve the CSMA/CD network by adding more hubs.4. After a collision, the station that detected the collision has first priority to resend the lost data.5. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.

1 and 3
2 and 5
1,3 and 4
2 and 4

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Computer Networking
The fundamental requirements of private-to-public network interconnection methods which need to be provided in gateways is/are

None of these
adequate cost control mechanisms for administration of the private networks
to assign address to private network DTEs
universal accessibility for private network Data Terminal Equipment (DTE)
A and B both

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Computer Networking
You type the following command into the router and receive the following output:Router#show serial 0/0 ^% Invalid input detected at '^' marker.Why was this error message displayed?

The router does not have a serial0/0 interface.
You need to be in privileged mode.
Part of the command is missing.
You cannot have a space between serial and 0/0.

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