A wireless access point (WAP) is a device that allows wireless communication devices to connect to a wireless
network using Wi-Fi, Bluetooth, or related standards. The WAP usually connects to a wired network, and it can
transmit data between wireless devices and wired devices on the network. Each access point can serve
multiple users within a defined network area. As people move beyond the range of one access point, they are
automatically handed over to the next one. A small WLAN requires a single access point. The number of
access points in a network depends on the number of network users and the physical size of the network.
Answer option C is incorrect. A wireless network interface card (WNIC) is a network card that connects to a
radio-based computer network, unlike a regular network interface controller (NIC) that connects to a wire-
based network such as token ring or ethernet. A WNIC, just like a NIC, works on the Layer 1 and Layer 2 of the
OSI Model. A WNIC is an essential component for wireless desktop computer. This card uses an antenna to
communicate through microwaves. A WNIC in a desktop computer is usually connected using the PCI bus.
Answer option A is incorrect. ExpressCard, a new standard introduced by PCMCIA, is a thinner, faster, and
lighter modular expansion for desktops and laptops. Users can add memory, wired or wireless communication
cards, and security devices by inserting these modules into their computers. ExpressCard slots are designed to
accommodate modules that use either Universal Serial Bus (USB) 2.0 or the PCI Express standard.
ExpressCard modules are available in two sizes, i.e., 34 mm wide (ExpressCard/34) and 54 mm wide
(ExpressCard/54). Both modules are 75 mm long and 5 mm high. An ExpressCard/34 module can be inserted
in either a 54 mm slot or a 34 mm slot, but an ExpressCard/54 requires a Universal (54 mm) slot. However, an
extender can be used with ExpressCard/34 slot to connect the ExpressCard/54 module from outside of the
computer. Both the modules are identical in performance. They take full advantage of the features of the PCI
Express or USB 2.0 interfaces. The only difference between them is that the ExpressCard/54 form-factor, due
to its larger surface area, allows for greater thermal dissipation than does an ExpressCard/34. As the
performance does not vary with module size, module developers usually prefer to fit their applications into the
smaller ExpressCard/34 form factor. But some applications, such as SmartCard readers, and CompactFlash
readers, require the extra width of an ExpressCard/54 module.
Answer option D is incorrect. A wireless repeater is a networking device that works as a repeater between a
wireless router and computers. It is used to connect a client to the network when the client is out of the service
area of the access point. If the wireless repeater is configured properly, it extends the range of the wireless
LAN network.