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Net Plus > Wires and Wireless > Flashcards

Wires and Wireless Flashcards

1
Q

802.11a

A

5 GHz
54 Mbps
120m

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2
Q

802.11b

A

2.4 GHz
11 Mbps
140m

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3
Q

802.11g

A

2.4 GHz
54 Mbps
140m
Backwards compatable w/ 802.11b

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4
Q

802.11n

A

5 GHz & 2.4GHz
600 Mbps
250m

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5
Q

WEP

A

64-bit or 128-bit key size
Cryptographic vulnerabilities
WEP can no longer be used

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6
Q

WPA

A

Short-term workaround after WEP
Used RC4 cipher as TKIP (Temporal Key Integrity Protocol)
TKIP has its own vulnerabilities

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7
Q

WPA2

A

Replaced TKIP with CCMP (Counter Mode with Cipher Block Chaining Message Authentication Code Protocol)
Replaced RC4 with AES (Advanced Encryption Standard)
Latest and most secure wireless encryption method

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8
Q

WPA2 Enterprise

A

Adds 802.1x

RADIUS server authentication

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9
Q

Two types of Optical Fiber

A

Multimode: Short-range communication (2km)

Single-mode: Long-range communication (100km)

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10
Q

Media Converters

A

OSI Layer 1
Copper to fiber, fiber to copper
Fiber conversion - single-mode to multimode

Connectors: ST, SC, LC, MT-RJ

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11
Q

CAT 3

A

10Base-T
10 Mbps
100m
RJ-11

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12
Q

CAT 5

A

100Base-TX
100 Mbps
100m
RJ-45

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13
Q

CAT 5e

A

1000Base-T
1000 Mbps
100m
RJ-45

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14
Q

CAT 6

A 
1000Base-T/10GBase-T
1000 Mbps = 100m 
- or -
10 Gbps = 55m
RJ-45
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15
Q

Coaxial Cable Composition

A 
(outside - in)
Plastic Jacket
Metal Shielding
Dielectric Insulator
Wire Conductor
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16
Q

UTP/STP

A

Unshielded/Shielded Twisted Pair

Plenup rated = fire-resistant cable jacket

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17
Q

Coaxial Cable

A

Older Ethernet networks (RG-8/U)
Broadband Internet (RG-56)
Short-distance video (RG59)

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18
Q

Straight Through Cable

A

Connects unlike devices

Same on both ends

19
Q

T1 Crossover Cable

A

Connects like devices

1————–4
2————-5
4————–1
5————-2

20
Q

568 A/B Crossover

A

Connects like devices

1----------3
2---------6
3---------1
4---------4
5---------5
6---------2
7---------7
8--------8
21
Q

568 A

A

WG | G | WO | BL | BLW | O | WB | B

22
Q

568 B

A

WO | O | WG | BL | BLW | G | WB | B

23
Q

CAT 6a

A

10GBase-T
10 Gbps
100m
RJ-45

24
Q

Decibles (dB)

A

A logarithmic scale

  • 3 dB = 2x the signal
  • 10 dB = 10x the signal
  • 20 dB = 100x the signal
  • 30 dB = 1000x the signal
25
Q

Calculating dB Loss

A

(through 1km of fiber)

Add loss through each section
     * 1 km fiber = 3.5 dB
     * Patch panel at each end = .5 dB
             (x2 patch panels) = 1 dB
 Total link loss = 4.5 dB
26
Q

T1

A

24 channels
64 kbps/channel
1.544 Mbps/line rate

27
Q

E1

A

32 channels
64 kbps/channel
2.048 Mbps/line rate

28
Q

T3

A

28 - T1 circuits
672 T1 channels
44.736 Mbps

29
Q

E3

A

16 - E1 circuits
512 E1 channels
33.368 Mbps

30
Q

10 Mbps Ethernet

A

10Base-T - Twisted Pair

31
Q

100 Mbps Ethernet

A

100Base-TX - CAT 5 twisted pair, 100m

100Base-FX - MMF (2km), SMF (2km+)

32
Q

1000 Mbps Ethernet

A

1000Base-T - CAT5e or CAT 6, uses all pairs, 100m
1000Base-LX - LW fiber, over 5km
1000Base-SX - SW fiber, 550m

33
Q

10 Gbps Ethernet

A 
10GBase-SR (short range) - MMF, 300m
10GBase-LR (long range) - SMF, 10km-25km
10GBase-ER (extended range) - SMF, 40km
10GBase-SW , 10GBase-LW, 10GBase-EW - 10G over  
     SONET and SDH
10GBase-T - CAT 6 (55m), CAT 6a (100m)
34
Q

Satellite Networking

A 
15 Mbps down/2 Mbps up
High latency
High Frequencies (line of sight, rain fade)
35
Q

ISDN

A

Integrated Services Digital Network

Two Types:

1) BRI (2B+D):
* 2-64k Bearer Channels (B)
* 1-16k Signaling Channel (D)
2) PRI (23B+D):
* T1 - 23B+D
* E1 - 30B+D+alarm channel

36
Q

DSL

A

Digital Subscriber Line

1) ADSL (Asymmetric DSL):
* 24 Mbps down/3.5 Mbps Up
2) SDSL (Symmetric DSL):
* Never Standardized
3) VDSL (Very high bitrate DSL)
* 4 Mbps to 100 Mbps

37
Q

Cable Modem

A

DOCSIS (Data Over Cable Service Interface Specification)

4 Mbps-100 Mbps

38
Q

Dialup

A

Legacy System

56k

39
Q

CSU/DSU

A

Channel Service Unit/Data Service Unit

Connects WAN to DTE

40
Q

Rollover Cable

A

Administrative console

1------------8
2-----------7
3-----------6
4-----------5
5-----------4
6-----------3
7-----------2
8-----------1
41
Q

Router

A

Multiple Broadcast Domains

42
Q

Layer 2 Switch

A

Single Broadcast Domain

Multiple Collision Domains

43
Q

Wireless AP

A

Single Broadcast Domain

Single Broadcast Domain

44
Q

Hub

A

Single Broadcast Domain

Single Collision Domain

Net Plus (7 decks)

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