Chapter 8 Review Questions Flashcards
which of the following wireless IEEE standards operate on the 2.4 GHz radio frequency and are directly compatible with each other?
- 11a
- 11b
- 11ac
- 11g
802.11b and 802.11g both operate in the 2.4 GHz frequency and use similar transmission standards. 802.11aand 802.11ac both use 5 GHz frequency.
What is the primary function of the SSID?
To secure communication between a web browser and a server
To secure communication between a server and a remote host
To serve as a parameter used to identify a network and configure a wireless connection
To serve as a typr of password used to secure a wireless connection.
A Service set idenifier (SSID) is the unique name given to network. All hardware that is to participate on the network must be configured to the same SSID. It is basically the network name.
Which of the following are features that allow 802.11ac to achieve higher data throughput?
MIMO
Beamforming
Channel bonding
Code division mulitplexing
MIMO and Channel bonding. Channel bonding is the combination of multiple smaller channels into one large channel for greater bandwidth. MIMO is enhanced over 802.11n to allow for more multiple inputs and outputs. 802.11ac uses beamforming but this helps with range, not throughput.
What is the most secure wireless encryption standard for 802.11 networks?
WEP
WPA
WPA2
SAFER+
WPA2. WEP and WPA are previous version and SAFER+ encrypts bluetooth.
What level of quality of service is designated for interactive voice and video?
1
4
5
6
Level 5 is desiganted for voice and audio with a latency of less than 100ms. Level is for background applications and is low priority. Level 4 is known as controlled load, which is lower in priority and level 6 is for controlled traffic.
You have just installed a wireless router on you home network. Which of the following should you do to make it highly secure?
Change the defualt adminstrator name and password
Change the SSID
Enable WEP
Configure it to channel 11
You should always change the defualt admin passwords and change the SSID. Encrption is a good idea but WEP is outdated so you should choose WPA2. Channels have nothing to do with security.
You are setting up a small office network for a client. Which internet service would you recommend to provide the best speed?
DSL
Dial-up
Satellite
BRI ISDN
PRI ISDN
DSL is the best option for speed. DSL is much slower and BRI ISDN and PRI ISDN don’t even come close. Satellite is also much slower than DSL.
Which service allows users with provate IP addresses to acess the internet using a public IP address?
DHCP
DNS
DMZ
NAT
Network Address Translation allows users to have a provate IP address and still access the internet. NAT is installed on the router and translates the private IP address into a public IP address for the user to access the internet. DHCP assigns IP configuration information. DNS resolves hostnames to IP addresses and a DMZ is an area on a network between and external and internal router.
You are installing a single 802.11g wireless network. The office has space is large enough that you need three WAP’s. What channels should you configure the WAP’s on to avoid comminucation issues.
2, 5 and 7
1, 8 and 14
1, 6, 11
3, 6, and 9
1, 6, and 11. there are 14 communications channels in the 2.4 GHz range, but only the first 11 are configurable. The three non-overlapping channels are 1, 6, and 11.
You are setting up a wireless network. Which wireless standard would give the users over 40 Mpbs throughput?
- 11ac
- 11b
- 11g
- 11n
- 11ac = 1300 Mbps
- 11g = 54 Mbps
- 11g = 600 Mbps
You have been asked to configure a network for a small office. The wireless is installed, and now you need to connect the client computers. What do you enter on the client computers to connect to the router?
The adminstrator password
The security phrase
The client’s MAC address
The default router password
The security phrase. As an administrator you ashould have changed the default security phrase and made sure it is different from the administrator password.
Which of the following technologies can operate in the 123 kHz to 132 kHz ranges?
Bluetooth
RFID
NFC
LTE
RFID = 125 kHz/134kHz, 13.56 MHz or 856 MH
Bluetooth = 2.4 GHz
NFC = 13.56 MHz
LTE = 600 MHz and 6 GHz.
Which of the following are advantages to using dial-up internet?
High speed
Broad availability
Low cost
High security
Broad availability
Low cost
It definitely isn’t high speed and security isn’t any different from other wireless standards.
Which of the following security standards was the first to introduce a dynamic 128-bit packet security key?
WEP
TKIP
AES
CCMP
WEP could use a 64-128 bit key but it was static. TKIP introduced a dynamic per-packet key. AES and CCMP came after TKIP.
You are running an 802.11g wireless router in mixed mode. You have three 802.11 wireless NIC’s using the router. A new user connects using an 802.11b wireless NIC. What will happen?
The user with 802.11b will access the network at 11 Mbps, while the users with 802.11g will access the network at 54 Mbps
The user with 802.11b will not be able to access the network
The user with 802.11b will access the network at 11 Mbps. The users with 802.11g will access the network at 54 Mbps, nuless they are communicating with the 802.11b device, which will be at 11 Mbps
All users will access the network at 11 Mbps
All users will access the network at 11 Mbps. The good news is 802.11g is backward compatible. The bad news is if you run a mixed environment, all devices using the WAP will slow down to accomodate the older technology.
