Lesson 7

Question 1

Cross talk

Answer 1

A potential problem that occurs when copper cables (such as twisted pair) are close to each other. Data from one cable crosses over to the other cable causing collisions or resulting in loss of confidentiality.

Question 2

Electromagnetic interference (EMI)

Answer 2

EMI is interference caused by machinery and electrical devices.

Question 3

Fiber-optic cable

Answer 3

A cable type that uses light pulses instead of electrical signals to send data down a glass or plastic core cable. Fiber is immune to EMI, RFI, and crosstalk.

Question 4

Interception

Answer 4

Eavesdropping, or capturing traffic as it crosses a network. Protocol analyzers or sniffers, such as Microsoft’s Network Monitor, can capture the traffic.

Question 5

Multimode fiber

Answer 5

Multimode fiber (MMF) uses a plastic core and can transfer data at up to 100 Mbps and as far as 2 km, or up to 10 Gbps for shorter distances. MMF supports a wider variety of light sources than SMF.

Question 6

Network Monitor

Answer 6

Microsoft’s version of a protocol analyzer. It captures frames of data going across a network so that the data can be analyzed. Protocol analyzers are also known as sniffers.

Question 7

Nonpromiscuous mode

Answer 7

A mode of a protocol analyzer that allows it only to capture traffic going to or coming from the system. Promiscuous mode allows it to capture any traffic that reaches its network interface card, no matter what the source or destination IP address is.

Question 8

Plenum safe

Answer 8

A rating for cable indicating that is safe to use within a plenum (an open space between walls, below floors, or above ceilings). Nonplenum safe cable can release toxic fumes if it catches fire.

Question 9

Promiscuous mode

Answer 9

A mode of a protocol analyzer that allows it to capture any traffic that reaches its network interface card. Nonpromiscuous mode only allows the system to capture traffic going to or coming from the system.

Question 10

Radio frequency interference (RFI)

Answer 10

RFI is interference caused by radio signals broadcasted over the air.

Question 11

Single mode fiber

Answer 11

Single-mode fiber (SMF) uses a glass core and can transfer data at up to 10 Gbps and as far as 40 km. SMF doesn’t support as many light sources as MMF.

Question 12

Twisted pair

Answer 12

A commonly used transmission media type. Current versions include four twisted pair within a single cable.