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Chapter 4 – Wireless LAN Infrastructure Devices 101
Answers to Review Questions
1.
A, C. When an access point is used in repeater mode, throughput of the wireless
connection to clients is significantly reduced due to the access point having to listen
to the clients and retransmit every frame upstream over the same wireless segment.
This situation causes much more contention for the medium than would normally be
expected. Having a series of repeater hops can cause data corruption. Use of only
one repeater in a series is recommended.
2.
C. PCI cards and Ethernet converters use PCMCIA cards for connectivity into the
wireless LAN. In this scenario, only PCMCIA cards themselves are standalone
wireless LAN connectivity devices.
3.
C. Access points, when serving in root or repeater mode, allow only client
connectivity. In this scenario, wireless bridges should be used, but in their absence,
many wireless access points support a bridging mode where the access points can
effectively be a wireless bridge connecting two wired segments together wirelessly.
Although an access point in repeater mode can talk to another access point, it does
so as a client and on behalf of other clients, and multiple wired segments cannot be
connected using access points in this manner.
4.
B. The purpose behind repeater mode is to extend the wireless segment to users
who cannot see the access point connected to the wired LAN. Many times repeater
mode is used because an additional access point could not be connected to the wired
infrastructure in a particular area of a facility.
5.
B, C. There are two basic configurations using wireless bridges: point-to-point and
point-to-multipoint. Building-to-building bridging can take on either of these
configurations. Clients cannot connect to wireless bridges, and wireless bridges are
not security devices.
6.
A. If highly directional antennas are misaligned only slightly, it can result in a loss
of throughput in the wireless link. For this reason, administrators often use semidirectional antennas in order to simplify the task of alignment and to minimize the
chance of misalignment caused by things such as wind loading.
7.
D. Wireless residential gateways, which are sometimes referred to as SOHO
devices, provide the necessary connectivity for both wired and wireless clients in a
small network environment. Additionally, these gateways provide needed upstream
Internet connectivity and internal functionality, such as DHCP, that eases
administrative overhead.
8.
C. Some wireless enterprise gateways support role-based access control (RBAC)
where profiles can be attached to user accounts allowing specific types of access
functionality, such as rate limiting, on a per-user basis.
9.
B. Access points and bridges are typically mounted inside the building unless
placed in a weatherproof enclosure. It is often more economical to place access
points and bridges indoors, requiring that the antenna be detachable. Mounting the
antenna outdoors and running a long cable between the antenna and access point
allow the administrator to protect the access point against weather and theft.