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Andrew Cisco Network > Chapter 4: Network Access > Flashcards

Chapter 4: Network Access Flashcards

1
Q

What is Synchronous signaling?

A

Synchronous transmissions are synchronized by an external clock

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2
Q

What is asynchronous signalling?

A

asynchronous transmissions are synchronized by special signals along the transmission medium

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3
Q

What is Bandwidth?

4.1.3.2

A

bandwidth measures the amount of data that can flow from one place to another in a given amount of time.

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4
Q

What is Throughput?

4.1.3.2

A

Throughput is the measure of the transfer of bits across the media over a given period of time.

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5
Q

What is good put?

4.1.3.2

A

Goodput is the measure of usable data transferred over a given period of time

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6
Q

What is EMI?

A

Electromagnetic Interference

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7
Q

What is RFI?

A

Radio Frequency Interference

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8
Q

What causes Electromagnetic Interference?

A

disturbance that affects an electrical circuit due to either electromagnetic induction

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9
Q

What causes Radio Frequency Interference

A

or electromagnetic radiation emitted from an external source.

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10
Q

What is crosstalk?

4.2.1.1

A

Crosstalk is a disturbance caused by the electric or magnetic fields of a signal on one wire to the signal in an adjacent wire.

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11
Q

How do stop crosstalk?

A

Twisted-pair cable, shielded cable, and keeping cables further apart help prevent crosstalk

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12
Q

What is the difference between Copper and fiber cables?

A

Copper cables are cheaper to run, easy to handle and install, but can not exceed more than a 100m before signal degrades.

Fiber cables a very expensive, have better signals, can carry data over very long distances. Very hard to install and configure.

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13
Q

What is wireless media?

4.2.4.1

A

Wireless media carry electromagnetic signals that represent the binary digits of data communications using radio or microwave frequencies.

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14
Q

What is the IEEE No. for 5GHz Wireless Media speeds of up to 54 Mb/s?
4.2.4.4

A

IEEE 802.11a speeds of up to 54 Mb/s

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15
Q

What is the IEEE No. for 2.4GHz Wireless Media with a speeds of up to 11 Mb/s?
4.2.4.4

A

IEEE 802.11b speeds of up to 11 Mb/s

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16
Q

What is the IEEE No. for 2.4GHz Wireless Media with a speeds of up to 54 Mb/s?
4.2.4.4

A

IEEE 802.11g speeds of up to 54 Mb/s

17
Q

What is straight through and where do you use it?

A

Straight-through cable is used to connect computers and other end-user devices (e.g., printers) to networking devices such as hubs and switches

18
Q

What is crossover cable and where do you use it?

A

the wires on the cable are crossed over so that the receive signal pins on the RJ-45 connector.

Its purpose is to allow the direct connection of two LAN devices, such as two hubs, two switches or a hub and a switch. It can also be used to create a direct connection between two computers.

19
Q

What is a roll over cable and where do you use it?

A

A flat blue cable used to connect a computer terminal to a router’s console port

20
Q

What is Single-Mode fiber cable (SMF)?

4.2.3.3

A

Consists of a very small core and uses expensive laser technology to send a single ray of light. Popular in long-distance situations spanning hundreds of kilometers such as required in long haul telephony and cable TV applications.

21
Q

What is Multi-Mode fiber cable (SMF)?

4.2.3.3

A

Consists of a very small core and uses expensive laser technology to send a single ray of light. Popular in long-distance situations spanning hundreds of kilometers such as required in long haul telephony and cable TV applications.

22
Q

What is a Physical Topologies?

4.4.1.2

A

physical connections and identifies how end devices and infrastructure devices such as routers, switches, and wireless access points are interconnected. Physical topologies are usually point-to-point or star

23
Q

What is a logical Topologies?

4.4.1.2

A

This arrangement consists of virtual connections between the nodes of a network. These logical signal paths are defined by data link layer protocols

24
Q

What is a Point-to-Point connection Topology?

4.4.2.1

A

permanent link between two endpoints. For this reason, this is a very popular

25
Q

What is Hub and Spoke Topology?

4.4.2.1

A

A WAN version of the star topology in which a central site interconnects branch sites using point-to-point links.

26
Q

What is a star Topology?

4.4.3.1

A

End devices are connected to a central intermediate device

27
Q

What is a bus Topology?

4.4.3.1

A

All end systems are chained to each other and terminated in some form on each end

28
Q

What is a ring Topology?

4.4.3.1

A

End systems are connected to their respective neighbor forming a ring.

29
Q

What is Half Duplex communication?

4.4.2.4

A

Both devices can both transmit and receive on the media but cannot do so simultaneously.

30
Q

What is Full Duplex communication?

4.4.2.4

A

Both devices can transmit and receive on the media at the same time.

31
Q

What is Carrier Sense Multiple Access (CSMA) ?

4.4.3.3

A

When the device attempting to transmit sees that the media is busy, it will wait and try again after a short time period.

32
Q

What is Carrier sense multiple access with collision detection (CSMA/CD)
4.4.3.3

A

If signals are then detected that show another device was transmitting at the same time, all devices stop sending and try again later

33
Q

What is Carrier sense multiple access with collision avoidance (CSMA/CA)
4.4.3.3

A

The end device examines the media for the presence of a data signal. If the media is free, the device sends a notification across the media of its intent to use it. Once it receives a clearance to transmit, the device then sends the data.

34
Q

What is the logical link control (LLC)?

A

The Ethernet LLC sublayer handles the communication between the upper layers and the lower layers. This is typically between the networking software and the device hardware

35
Q

What is the media access control (MAC)

A

The MAC sublayer provides addressing and channel access control mechanisms that make it possible for several terminals or network nodes to communicate

Andrew Cisco Network (15 decks)

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