Aunt Ann’s Kitchen Situation: Aunt Ann’s Kitchen offers a line of specialty food
ID: 3767377 • Letter: A
Question
Aunt Ann’s Kitchen Situation: Aunt Ann’s Kitchen offers a line of specialty food products to institutional customers and restaurant chains. The firm prides itself on using only the finest ingredients and preparation methods. The owner, Ann Rose, hired you as an IT consultant to help her plan the system architecture for a new WLAN that will connect employee computers to the main (wired) network. She asked you to start with the following questions:
a. What possible IEEE 802.11 amendments could be used for the new system? What are the pros and cons of each amendment?
b. Choose an amendment to implement and explain your choice.
c. Suppose that microwave ovens and cordless telephones are used extensively in some parts of the facility. Would that affect your IEEE 802.11 amendment choice? If so, why?
d. Suppose that the new WLAN will also provide roaming services for employees with portable notebook computers. Which wireless topology will be required?
Has to submitted in 3 hours. Thanks.
Explanation / Answer
a)the following ammendments can be used:
1)
802.11g
In 2002 and 2003, WLAN products supporting a newer standard called 802.11g emerged on the market. 802.11g attempts to combine the best of both 802.11a and 802.11b. 802.11g supports bandwidth up to 54 Mbps, and it uses the 2.4 Ghz frequency for greater range. 802.11g is backwards compatible with 802.11b, meaning that 802.11g access points will work with 802.11b wireless network adapters and vice versa.
2)
802.11n (also sometimes known as "Wireless N") was designed to improve on 802.11g in the amount of bandwidth supported by utilizing multiple wireless signals and antennas (called MIMO technology) instead of one. Industry standards groups ratified 802.11n in 2009 with specifications providing for up to 300 Mbps of network bandwidth. 802.11n also offers somewhat better range over earlier Wi-Fi standards due to its increased signal intensity, and it is backward-compatible with 802.11b/g gear.
3)802.11a
While 802.11b was in development, IEEE created a second extension to the original 802.11 standard called 802.11a.
Because 802.11b gained in popularity much faster than did 802.11a, some folks believe that 802.11a was created after 802.11b. In fact, 802.11a was created at the same time. Due to its higher cost, 802.11a is usually found on business networks whereas 802.11b better serves the home market.
802.11a supports bandwidth up to 54 Mbps and signals in a regulated frequency spectrum around 5 GHz. This higher frequency compared to 802.11b shortens the range of 802.11a networks. The higher frequency also means 802.11a signals have more difficulty penetrating walls and other obstructions.
4)802.11ac
The newest generation of Wi-Fi signaling in popular use, 802.11ac utilizes dual band wireless technology, supporting simultaneous connections on both the 2.4 GHz and 5 GHz Wi-Fi bands. 802.11ac offers backward compatibility to 802.11b/g/n and bandwidth rated up to 1300 Mbps on the 5 GHz band plus up to 450 Mbps on 2.4 GHz.
b)According to me 802.11n should be used as it provides extremely high speed and a great signal range.This os very important for the employees to interact with each other to work together for the company.we can also use 802.11ac as it provides the best signal and bandwidhth till date and can also prevent multiple signals from interfering. These 2 standards can be employed to provide the best possible outcome for the company.
c)Suppose that microwave ovens and cordless telephones are used extensively in some parts of the facility. No it will not affect the strndards IEE802.11n and ac. since 802.11 n provides fastest maximum speed and best signal range; more resistant to signal interference from outside sources( like overns and cordless phones).it has an increased amount of bandwidth supported by utilizing multiple wireless signals and antennas (called MIMO technology) instead of one. Industry standards groups ratified 802.11n in 2009 with specifications providing for up to 300 Mbps of network bandwidth..as a result signal interefrence is miniumum due to high speed and bandwidth.
This time of problem is usually faced in IEEE802.11B
802.11b uses the same unregulated radio signaling frequency (2.4 GHz) as the original 802.11 standard. Vendors often prefer using these frequencies to lower their production costs. Being unregulated, 802.11b gear can incur interference from microwave ovens, cordless phones, and other appliances using the same 2.4 GHz range. However, by installing 802.11b gear a reasonable distance from other appliances, interference can easily be avoided.
d)
IEEE standards for 802.11r and 802.11k are used for roaming services.
Currently, IEEE 802.11k and 802.11r are the key industry standards for enabling seamless basic service set (BSS) transitions in the WLAN environment. The 802.11r and 802.11k standards support Wi-Fi 802.11r Fast Transition, secure authentication, and 802.11k neighbor list radio management.
With Cisco Unified WLAN controllers running release 7.4 or higher, mobile wireless devices running Apple iOS 6 and higher leverage 802.11k neighbor lists for enterprise roaming.
The following steps describe how an Apple iPhone requests, receives, and processes an 802.11k neighbor list:
The use of 802.11k radio resource management (RRM) process allows the mobile client device to roam efficiently and quickly. This is a requirement for good call quality in an enterprise environment where on-call roaming is common. As smartphone vendors adopt the 802.11r and 802.11k standards, their users can experience more efficient roaming along with good call quality during the roam.
The recommended WLAN controller (WLC) 802.11k configuration is to enable the RRM to provide both 2.4 GHz and 5 GHz AP channel numbers in the neighbor list response packets. Cisco recommends the use of 5 GHz band Wi-Fi channels for not only voice and video over WLAN calls but for all applications and devices.
With the neighbor list information, the mobile client device need not examine all of the 2.4 GHz and 5 GHz channels to find an AP it can roam to. This provides the following benefits:
The device does not have to process all of the probe response frames it receives on a channel. It only needs to validate that it can connect to an AP that is provided in the list of APs in the 802.11k neighbor list response frame.
All Wi-Fi products support at least 40-bit encryption through the wired equivalent privacy (WEP) specification, but the minimum standard on recent products is 64-bit WEP encryption. Many vendors offer 128-bit or 256-bit encryption on their products. However, the 128-bit and stronger encryption feature is more common among enterprise products than SOHO–oriented products. Unfortunately, the WEP specification at any encryption strength has been shown to be notoriously insecure against determined hacking. Enabling WEP keeps a casual snooper at bay, but someone who wants to get into your wireless network won’t have much trouble breaking WEP. For that reason, all wireless network products introduced after 2003 incorporate a different security standard known as Wi-Fi Protected Access (WPA). WPA is derived from the developing IEEE 802.11i security standard. WPA-enabled hardware works with existing WEP-compliant devices, and software upgrades are often available for existing devices to make them WPA capable. The latest 802.11g and 802.11n devices also support WPA2, an updated version of WPA that uses a stronger encryption method. (WPA uses TKIP or AES; WPA2 uses AES.)
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