The 8051 uses the crystal for precisely that: to synchronize
it’s operation. Effectively, the 8051 operates using what
are called "machine cycles." A single machine cycle is the
minimum amount of time in which a single 8051 instruction
can be executed. although many instructions take multiple
cycles.
1. A switch is a a hub with more ports
2. A switch is a multi-port bridge
3. Switches learn IP addresses from each frame and filter
the network using these addresses
4. Switches learn MAC addresses by examining the source
address of each frame
Answers No. 1 & 4 are true. As a switch is a hub to connect
devices and unicast while Hub is multicast.
Switch is use to deliver packets systems to systems
(identify MAC)
1. They are configured by default on all switch ports
2. They only work with a type of Ethernet network-not with
Token Ring, FDDI
3. You can set trunk links to any 10-, 100-, and 1000 Mbps ports
4. You must clear the unwanted VLANs by hand
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