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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
Calculating dB Loss
(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
T1
24 channels 64 kbps/channel 1.544 Mbps/line rate
27
E1
32 channels 64 kbps/channel 2.048 Mbps/line rate
28
T3
28 - T1 circuits 672 T1 channels 44.736 Mbps
29
E3
16 - E1 circuits 512 E1 channels 33.368 Mbps
30
10 Mbps Ethernet
10Base-T - Twisted Pair
31
100 Mbps Ethernet
100Base-TX - CAT 5 twisted pair, 100m | 100Base-FX - MMF (2km), SMF (2km+)
32
1000 Mbps Ethernet
1000Base-T - CAT5e or CAT 6, uses all pairs, 100m 1000Base-LX - LW fiber, over 5km 1000Base-SX - SW fiber, 550m
33
10 Gbps Ethernet
``` 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
Satellite Networking
``` 15 Mbps down/2 Mbps up High latency High Frequencies (line of sight, rain fade) ```
35
ISDN
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
DSL
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
Cable Modem
DOCSIS (Data Over Cable Service Interface Specification) 4 Mbps-100 Mbps
38
Dialup
Legacy System | 56k
39
CSU/DSU
Channel Service Unit/Data Service Unit | Connects WAN to DTE
40
Rollover Cable
Administrative console ``` 1------------8 2-----------7 3-----------6 4-----------5 5-----------4 6-----------3 7-----------2 8-----------1 ```
41
Router
Multiple Broadcast Domains
42
Layer 2 Switch
Single Broadcast Domain | Multiple Collision Domains
43
Wireless AP
Single Broadcast Domain | Single Broadcast Domain
44
Hub
Single Broadcast Domain | Single Collision Domain

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