Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1. Word processing applications communicate to the Application layer interface, but do not operate at layer 7, so the answer would be none.
The IEEE 802.11b standard provides three non-overlapping channels.
A transmission to the MAC address ff : ff : ff : ff : ff : ff is a broadcast transmission to all stations.
After the expiration of the backoff algorithm , all hosts have equal priority.
To use VLSM, the routing protocols in use possess the capability to transmit subnet mask information.
The typical banner is a message of the day (MOTD) and is set by using the global configuration mode command banner motd.
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