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22 Cards in this Set
- Front
- Back
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define:network
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Network - A network is a group of computers connected together in a way that allows information to be exchanged between the computers
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define:node
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A node is anything that is connected to the network. While a node is typically a computer, it can also be something like a printer or CD-ROM tower
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define:segment
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A segment is any portion of a network that is separated, by a switch, bridge or router, from other parts of the network
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define:backbone
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The backbone is the main cabling of a network that all of the segments connect to. Typically, the backbone is capable of carrying more information than the individual segments. For example, each segment may have a transfer rate of 10 Mbps (megabits per second), while the backbone may operate at 100 Mbps.
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define:topology
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Topology is the way that each node is physically connected to the network (more on this in the next section).
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define:lan
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A LAN is a network of computers that are in the same general physical location, usually within a building or a campus. If the computers are far apart (such as across town or in different cities), then a Wide Area Network (WAN) is typically used
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define:nic
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Every computer (and most other devices) is connected to a network through an NIC. In most desktop computers, this is an Ethernet card (normally 10 or 100 Mbps) that is plugged into a slot on the computer's motherboard
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define:mac
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This is the physical address of any device -- such as the NIC in a computer -- on the network. The MAC address, which is made up of two equal parts, is 6 bytes long. The first 3 bytes identify the company that made the NIC. The second 3 bytes are the serial number of the NIC itself.
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define:unicast
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A unicast is a transmission from one node addressed specifically to another node
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define:multicast
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In a multicast, a node sends a packet addressed to a special group address. Devices that are interested in this group register to receive packets addressed to the group. An example might be a Cisco router sending out an update to all of the other Cisco routers.
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define:broadcast
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In a broadcast, a node sends out a packet that is intended for transmission to all other nodes on the network.
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list 4 of the most commonly used networking topologies in use today.
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bus,ring,star,star bus
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fill in the blanks: In a _____ _____ ______, switches replace all the hubs of an Ethernet network with a dedicated segment for every node.
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fully switched network
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List the 3 methods by which a lan switch can forward packets.
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store and forward,fragment free, cut-through
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True or False:A hub or a switch will pass along any broadcast packets they receive to all the other segments in the broadcast domain, but a router will not.
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true
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define:transparent bridging
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Allows the switch to learn everything it needs to know about the location of nodes on the network without the network admin having to do anything.
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What are the five parts of transparent bridging
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learning,flooding,filtering,forwarding, aging.
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Describe the "learning process" for a switch.
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After a switch has been added to a network, it receives its first frame, reads the source mac address and stores this in the segments lookup table
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what is "flooding" in terms of transparent bridging.
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When a switch does not know what segment a node is on it floods the frame to all ports except the one it came in on
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what is "fowarding" in terms of transparent bridge.
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when a switch knows which segment a node is on, it forwards the frame directly to that port.
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describe "filtering" in terms of transparent bridging
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The switch can determine if two communicating nodes on the same segent it wont need to do anything
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describe the technique "aging" in terms of transparent bridging
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The switch will time stamp entries in the lookup table. If there is no activity from a node after a certain amount of time the entry is removed.
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