16. Connecting to a Network

Question 1

Purpose of modems?

Answer 1

Transmit frames across the WAN link

Question 2

Purpose of routers?

Answer 2

Forwards packets between networks

Question 3

Cellular digital communications standards

How does GSM differ from TIA?

Answer 3

Enabling SIM card use on unlocked devices with chosen providers

Question 4

Cellular digital communications standards

How does TIA differ from GSM?

Answer 4

By tying the subscriber’s identity to the provider-managed device

In CDMA, device switching requires provider involvement

No SIM card in use.

Question 5

802.11a bandwidth?

Answer 5

54 Mbps

Question 6

What band does 802.11a use?

Answer 6

5GHz

Question 7

802.11b bandwidth?

Answer 7

11 Mbps

Question 8

What band does 802.11b use?

Answer 8

2.4GHz

Question 10

802.11g bandwidth?

Answer 10

54 Mbps

Question 11

What band does 802.11g use?

Answer 11

2.4GHz

Question 12

802.11n bandwidth?

Answer 12

72.2 Mbps/stream (Single Channel)
150 Mbps/stream (Bonded Channels)

Question 13

What band does 802.11n use?

Answer 13

2.4 &/or 5 GHz

Question 14

802.11ac bandwidth?

Answer 14

1.7Gbps

Question 15

What band does 802.11ac use?

Answer 15

5GHz

Question 16

Purpose of compatibility mode in access points?

Answer 16

Broaden device support by accomodating old & new 802.11 standards

i.e. You might have a new router that supports 802.11ac but computers and tablets with wireless adapters that only support 802.11n. You can use the access point in compatibility mode to allow these devices to connect.

Question 17

Downside to compatibility mode in access points?

Answer 17

Network can be slowed down

especially if 802.11b clients have to be supported. If possible, use newer standards only.

Question 18

3 common encryption standards routers support?

Answer 18

• WEP
• WPA
• WPA2

Question 19

Meaning of WEP?

Answer 19

Wired Equivalent Privacy

Question 20

Meaning of WPA?

Answer 20

Wi-Fi Protected Access

Question 21

Which encryption standard is stronger for routers?

Answer 21

WPA

or WPA2

WEP is flawed and you would only select this if compatibility with legacy devices and software is imperative.

Question 22

What happens when a Windows Computer’s network configuration is set as Public?

Answer 22

Computer is undiscoverable & file sharing is disabled

Computer is hidden from other computers on the same network

Question 23

What happens when a Windows Computer’s network configuration is set as Private?

Answer 23

Computer is discoverable & file sharing is enabled

Question 24

Meaning of DRS?

Answer 24

Dynamic Rate Switching/Selection

Question 25

Purpose of Wi-Fi’s DRS feature?

Dynamic Rate Switching/Selection

Answer 25

To allow devices to dynamically adjust data transmission rates based on signal quality

If the signal is strong, the station will select the highest available data rate, determined by the 802.11 standard. If the signal is weak, the station will reduce the data rate to try to preserve a more stable connection.

Question 26

How are ports in a Switch/AP logically divided into groups?

Answer 26

via VLAN technology

Virtual LAN

Question 27

How are communications between VLANs made?

Answer 27

via router

Question 28

What does attenuation mean?

Answer 28

Loss of signal strength