Quiz 12 : Essentials of Networking

How many pairs of wires are in UTP Ethernet cables?

4 - UTP Ethernet cables have four pairs of wires

MAC addresses are made up of how many bits?

48 - MAC addresses are made up of 48 bits.

Which is not a network cable type?

Plenum - Plenum describes any type of cable with a fire-resistant jacket. Coax, unshielded twisted pair (UTP) and shielded twisted pair (STP) are all types of network cable.

Which device forwards data from one network to another?

Router - A router forwards network traffic from one network to another. Switches and hubs transmit traffic within a LAN. e-mail may send data from one network to another but it is an application/protocol, not a device.

Which device retransmits any inbound message out all of its other ports?

Hub - A hub repeats inbound traffic out all of its other ports. Switches only retransmit data out the port that the intended receiver is connected to. Routers forward traffic to remote networks as required. Smart repeater is an unofficial term for a switch.

Multimode fiber optic cables use what for their light source?

LEDs - Multimode fiber cables use LEDs to generate light pulses.

How are WANs identified?

Logical addresses - Networks are identified by logical addresses (IP addresses). Physical, MAC, and Ethernet addresses are all different names for the same thing.

Wake-on-LAN is triggered by what?

Magic packet - When supported, a magic packet triggers Wake-on-LAN.

Which do link lights not normally indicate?

Duplex status - Link lights do not normally indicate duplex status. They do show link/connection status, indicate connection speed, and show activity.

What goes at the end of an Ethernet frame?

FCS - The frame check sequence (FCS) goes at the end of an Ethernet frame. In order, an Ethernet frame includes the destination MAC addresses, the source MAC address, the data payload, and finally the FCS.

Which is the best tool to identify a specific cable within a bundle of cables?

Fox and Hound - A tone probe and tone generator, also called a Fox and Hound, can easily identify a specific cable within a bundle. Neither a TDR nor a continuity tester can identify a specific cable in a bundle. A punch down tool is not a diagnostic tool.

How does a switch know the MAC addresses of connected devices?

The switch learns the addresses by watching Frames - Switches watch all inbound frames and learn MAC addresses from them. Switches definitely need to know MAC addresses, which they learn automatically without needing to query hosts or be manually programmed.

Solid-core cabling is best used where?

To connect distant locations with horizontal runs and drops inside walls and plenum spaces - Solid-core cable is used in walls and horizontal runs because it is good for long runs and is not exposed to frequent bending. It is not used in environments where frequent bending occurs such as in patch panels, workspaces, or anywhere that it will be flexed regularly by people handling, stepping on, or tripping over it.