Unit 1 Flashcards

1
Q

How long can you run an Ethernet cable?

A

100 meters

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2
Q

How long can you run a fibre cable?

A

550 metres

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3
Q

What are some advantages of wireless network?

A

Fast installation, no wiring, access to network anywhere in range

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4
Q

What are some disadvantages to wireless networking?

A

Lower security, slower network, interference

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5
Q

What are the WiFi modes?

A

Ad Hoc Mode, Infrastructure mode, Mesh Mode, Monitor Mode, Promiscuous Mode, Repeater Mode, Bridged Mode

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6
Q

What is Ad Hoc Mode?

A

Independent devices without any infrastructure (I/BSS)

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7
Q

What is Infrastructure Mode?

A

Consists of APs, BSA (Basic Service Area, SSID, Distribution system (router)

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8
Q

What is Mesh mode?

A

Access points can communicate to all other access points, if one goes down it reconnects to another node

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9
Q

What is Monitor mode?

A

Sniffing raw traffic, used for design, does not need to be on authenticated

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10
Q

What is promiscuous mode?

A

Sniffing raw traffic on the network, after is has been connected/authenticated

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11
Q

What is repeater mode?

A

Rebroadcasts existing WiFi network

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12
Q

What is bridged mode?

A

Borrows existing wireless internet using a different SSID and password (two networks, one internet)

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13
Q

What does a WLAN controller do?

A

Extended Service Set (different channels), creates large networks and controls devices on them

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14
Q

What are the IEEE standards?

A

802.11b, a, g, n, and ac

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15
Q

What are the primary differences between 2.4 and 5 Ghz?

A

11 channels vs 24 channels
5 Mhz apart vs 20 mhz apart
20 mhz wide vs 20-40 mhz
3 non-overlapping channels vs all

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16
Q

What standards are 2.4 Ghz?

A

B, G, N

17
Q

What standards are 5 Ghz

A

A, N, AC

18
Q

What has more interference, 2.4 or 5 ghz?

A

2.4 ghz

19
Q

What is the top speed of 802.11 n

A

600 mbits/s

20
Q

What is the top speed of 802.11a/g

A

54 mbits/s

21
Q

What is the top speed of 802.11 ac

A

6.93 Gbits/s

22
Q

What does FHSS stand for?

A

Frequency Hopping Spread Spectrum

23
Q

What does DSSS standard for

A

Direct-Sequence Spread Spectrum

24
Q

What does OFDM stand for?

A

Orthogonal Frequency-Division Multiplexing

25
Q

What are the differences between modulations FHSS, DSSS, and OFDM?

A

FHSS: Radio hops (one band at a time), not used often, receiver synchronized with transmitter
DSSS: Whole chunk, multiple bands at once
OFDM: Multiple bands together, better protection from RF

26
Q

What are the types of antennas?

A

Omni-directional (dipole), semi-directional (yagi, patch), Parabolic Grid

27
Q

What does an omni-directional antenna do?

A

Home router - can be oriented different directions, weak signal spots above and below antenna

28
Q

What does a semi-directional antenna do?

A

Yagi: Long, horizontal, transmits in one direction, requires precision pointing (fixed point to point)
Patch: flat surface, wider transmission, point to point or multi point

29
Q

What does parabolic grid do?

A

Many directions, long distance point-to-point, (Teta’s satellite)

30
Q

What is open authentication?

A

No security, anyone can connect, requests IP address

31
Q

What is WEP?

A

Wired Equivalent Privacy - encrypted but not secure any more

32
Q

What is WPA?

A

Wireless Protected Access - increased protection. Pre-Shared Key (PSK) exchange and 4-way handshake

33
Q

What does TKIP stand for?

A

Temporal Key Integrity Protocol - 128-bit key for each packet

34
Q

What is WPA2?

A

Enhanced security WPA, not interopable with WPA, uses AES (Advanced Encryption Standard) instead of TKIP

35
Q

What is WPA-2 enterprise

A

Radius authentication - requires central database to authenticate users (infrastructure mode)

36
Q

Why does 2.4 Ghz have more interference?

A

More common devices, like cordless phones?

37
Q

What is MIMO?

A

essential part of wireless in, allows many connections in and out

38
Q

What are the control plane and data plane?

A

Control plane manages channels, frequency and protocols, while data plan manages data, usernames and passwords

39
Q

How do you secure a tunnel?

A

pre-shared key on both sides