Comptia Network+ Flashcards


Yet one other technology implemented by 802.11n is channel bonding. With channel bonding, two wi-fi bands could be logically bonded collectively, forming a band with twice the bandwidth of a person band. Some literature refers to channel bonding as 40-MHz mode, which refers again to the bonding of two adjoining 20-MHz bands right into a 40-MHz band. The 5-GHz band has the next number of channels, as in comparability with the 2.4-GHz band.

Frequency hopping networks are much much less widespread now, although, so I omit the frequency hopping extensions for simplicity. Likewise, the IBSS DFS element happen between the Quiet and TPC Report parts, have been it to appear. Beacon frames announce the existence of a community and are an important part of many network upkeep tasks. They are transmitted at regular intervals to allow cell stations to search out and establish a community, as well as match parameters for becoming a member of the network.

When the wireless MAC receives a body, it checks the BSSID and passes only frames within the station’s present BSSID to greater protocol layers. Wi-Fi Protected Access is a security normal for computing devices geared up with wi-fi web connections. WPA was developed by the Wi-Fi Alliance to provide more refined data encryption and better user authentication than Wired Equivalent Privacy , the unique Wi-Fi security standard. It was launched mainly to add newest bandwidth technology to the present 2G era. It supports higher-data-rate transmission for Web shopping and likewise supports a model new browsing format language called wi-fi utility protocol .

How is a switch chosen as a root bridge for spanning tree if the bridge priorities are the same? The change with the lowest IP handle will turn into the root bridge. The change with the bottom MAC handle will turn out to be the foundation bridge. The swap with the highest MAC handle will turn into the basis bridge. The switch with the best IP handle will become the basis bridge.

Frames are in the end despatched to the shopper, which is each the vacation spot and receiver. 802.11 attracts a distinction between the source and transmitter and a parallel distinction between the vacation spot and the receiver. The transmitter sends a frame on to the wi-fi medium but doesn’t necessarily create the frame. A similar distinction holds for destination addresses and receiver addresses. A receiver may uclahealthcyber be an intermediate vacation spot, but frames are processed by greater protocol levels solely once they attain the vacation spot. Perform supervisory features; they’re used to join and leave wi-fi networks and transfer associations from entry level to access level.

This enables backwards compatibility with older stations, as described in Chapter 14. The duration could also be set in considered one of two ways, relying on the place of the ACK inside the frame change. ACKs for full data frames and final fragments in a fragment burst set the duration to 0. The information sender indicates the end of a knowledge transmission by setting the More Fragments bit within the Frame Control header to 0.

The access-point/switch is the place you configure the network to use 802.1X as an alternative of Open/Unencrypted or WPA2/3-PSK. Also fails to offer a mechanism for performing person authentication. Network nodes are recognized by MAC which can simply be spoofed by hackers.

However, all stations receiving a PS-Poll body update the NAV by the quick interframe space plus the amount of time required to transmit an ACK. The computerized NAV update permits the access point to transmit an ACK with a small probability of collision with a mobile station. Instead of a Duration field, the PS-Poll frame uses the third and fourth bytes in the MAC header for the affiliation ID.


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