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3DX7X > Self-Test Vol. 1 Unit 5 > Flashcards

Self-Test Vol. 1 Unit 5 Flashcards

1
Q

What is the internet?

A

A network of networks; a series of private computer networks connected to each other.

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2
Q

What is the name for networks that use the same software and protocols as the public internet, but exist as a portion of an entity’s private network?

A

Intranet

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3
Q

What term describes a group of computers and devices that share a common communication line and resources in a small geographical area?

A

LAN

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4
Q

What type of network interconnects several local area networks by bridging them with backbone lines?

A

MAN

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5
Q

What is the name for a network connected between two cities?

A

WAN

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6
Q

Primary addressing in WLANs is achieved by using what type of address?

A

MAC

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7
Q

List the advantages to using WLAN?

A

Mobility, ease of installation, and lower costs

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8
Q

List each of the IEEE wireless standards.

A

802.11 a/b/g/n

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9
Q

The 802.11n standard operates at what frequency?

A

2.4GHz and 5 GHz

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10
Q

What network provides a private tunnel through the Internet?

A

VPN

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11
Q

What type of configuration does the Air Force use for most VPN traffic?

A

Gateway-to-gateway

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12
Q

What is a physical topology?

A

A map or description of the layout of the network media that interconnects the device on a network.

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13
Q

What is a logical topology?

A

The way in which devices communicate and transmit data throughout the network.

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14
Q

What is the rule of thumb to distinguish physical from logical topologies?

A

If you can see if and touch it, it’s physical.

If you cannot see it or touch it, it’s logical.

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15
Q

Because a topology affects the network’s capabilites, what is the impact of choosing one topology over another?

A

Type of equipment the network needs, capabilities of the equipment, growth of the network, and the way the network is managed.

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16
Q

What are the advantages of a bus topology?

A

Inexpensive to install, easy to add more workstations, requires less cable, works well for small networks.

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17
Q

What are the disadvantage of a bus topology?

A

No longer recommended; if backbone breaks, only limited number of devices, difficult to isolate problems, slower access time.

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18
Q

What are the advantages of a star topology?

A

Easy to add more devices, broken cable doesn’t affect entire network, easy to find device, upgradable, most common topology.

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19
Q

What are the disadvantages of a star topology?

A

Requires more media, failure of central hub can bring down network, higher costs.

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20
Q

What are the advantages of a ring topology?

A

Greater speed, no collision, easier to locate problems, no terminators needed.

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21
Q

What are the disadvantages of a ring topology?

A

Requires more cable, break in cable brings network down, adding devices suspends networks, not commonly used.

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22
Q

What are the two most common hybrid topologies?

A

Star-wired ring and star-wired bus

23
Q

What data transport method grew out of the need for a worldwide standard to allow interoperability of information, regardless of the information type or “end-system”?

A

ATM

24
Q

How many bytes make up the ATM cell, header, and payload?

A

53 bytes

25
Q

ISDN channels are separated into two sub-channels, list and describe the sub-channels.

A

Sub-channel B 56 Kbps or 64 Kbps and are used for both voice and data. Each B channel can carry a separate telephone call. The D-channel is a 16 Kbps use to carry call control (or supervisory) information. Ther information on the “D” channel tells the network switches what to do with the traffic on the “B” channels.

26
Q

What the full bandwidth of a T1 line is not needed it can be divided in 64 Kbps increments known as what?

A

Fractional T-1

27
Q

What Ethernet standard has supplanted Fast Ethernet in wired networks?

A

GbE (Gigabit Ethernet)

28
Q

Define modems.

A

A device that modulates signals to encode digital info and demodulates signals to decode the transmitted info.

29
Q

What are the two types of modems used?

A

Dial-up and dedicated.

30
Q

What is one of the principal functions of a CSU?

A

To provide a barrier for electrical interference from either side of the unit.

31
Q

What is the main function of a DSU?

A

To adapt the digital data stream produced by the customer’s equipment to the signaling standards of the telephone carrier equipment.

32
Q

What is the primary use for a bridge?

A

To decrease network congestion and propagates a signal like a repeater.

33
Q

What do LAN switches provide between network devices?

A

Collision-free, high-speed communication

34
Q

Can a switch connect LANs of different bandwidths? If so, give example.

A

Yes, through buffering.

35
Q

What type of switching is required when a moving frame from a low-speed LAN to a high-speed LAN?

A

Store-and-forward switching.

36
Q

What is the fundamental difference between Layer 2 and Layer 3 switching?

A

The layer at which each forwarding decision is made.

37
Q

Routers operate at which layer of the OSI model?

A

Layer 3

38
Q

What does a typical router contain?

A

An internal processor, an OS, memory, I/O jacks for different types of network connectors, and a management console interface.

39
Q

Routers compare metrics to determine optimal routes; these methods differ depending on what?

A

Depending on the routing algorithm used.

40
Q

What are routing protocols that manage traffic within an autonomous system called?

A

IGP

41
Q

Name two methods for directing data on the network.

A

Static and dynamic routing

42
Q

What is static routing?

A

A technique in which a network admin programs a router to use specific paths between nodes.

43
Q

What is dynamic routing?

A

Routing that automatically calculates the best path between the two nodes and compiles this info into a routing table.

44
Q

What are the two methods that encryption can be applied?

A

Link-by-link or an end-to-end basis.

45
Q

What is the most common telephone device used for voice encryption?

A

STE

46
Q

What are the most common types of all metallic cable used in networks?

A

Twisted-pair and coaxial

47
Q

Which cable type is associated with the original designs of the Ethernet standard?

A

Coaxial

48
Q

List and describe the four most common coax cable types.

A

RG-6, RG-58, RG-8, RG-11

49
Q

What medium is primary carrier for voice telecommunications?

A

Twisted-pair cable

50
Q

List and describe the categories of twisted pair cable.

A

CAT 1, CAT 3, CAT 5, CAT 5e, CAT 6, and CAT 6a

51
Q

What three things do an optical communications system require to transport communications?

A

A light source, a transmitter, and a receiver

52
Q

List the advantages of fiber optic systems over conventional cable systems.

A

Larger bandwidth, freedom from interference, low cost, and lightweight.

53
Q

Is fiber optic cable immune to EMI?

A

Yes

54
Q

What is the most common wireless networking standard?

A

IEEE 802.11

3DX7X (8 decks)

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