Term
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Definition
| acts like a repeater so that every segment receives transmissions sent from any other segment; the logical topology is a bus. Also known as multiport repeaters. |
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Term
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Definition
| provides communications between two or more segments. work at the data link layer since the need to understand the MAC addresses within frames. |
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Term
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Definition
| if a MAC address cannot be found in the MAC address table then the switch acts like a hub and transmits the frame out of all ports (except for the incoming port) |
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Term
| Content Addressable Memory (CAM) |
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Definition
| a special type of memory optimized for searching rather than random access. The MAC address table is often also referred to as the CAM table. |
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Term
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Definition
| Switches that do not offer any configuration or interface. |
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Term
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Definition
| Support more complex functions, including configuring VLANs, port authentication, load balancing, Quality of Service (QoS), and traffic shaping and filtering. |
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Term
| Authentication, Authorization, and Accounting (AAA) Server |
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Definition
| With an AAA server, the switch does not store user names or passwords. When a user attempts to connect, the switch sends the user's credentials to the AAA server. If the AAA server can authenticate the user, it notifies the switch, which then permits access. |
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Term
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Definition
| Aggregating multiple links into a single high-speed connection. For example, a single network adapter and cable might support 1 Gbps; bonding this with another adapter and cable gives a ling of 2 Gbps (adapter teaming). Bonding can also provide redundancy; if one link is broken the connection is still maintained by the other (fail over). |
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Term
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Definition
| Link Aggregation Group (LAG) |
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Term
| Link Aggregation Control Protocol (LACP) |
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Definition
| can be used to detect configuration errors and recover from the failure of one of the physical links. |
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Term
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Definition
| Copies all packets sent to one or more source ports to a mirror (or destination) port. Referred to as a Switched Port Analyzer (SPAN) on a Cisco switch. |
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Term
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Definition
| Different groups of computers on the same cabling and attached to the same switch(es) can appear to be in separate LANs. Nodes in each VLAN are in separate broadcast domains. |
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Term
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Definition
| The interconnection between multiple switches. One port on each switch would be configured as a trunk port. Can also provide redundant links. |
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Term
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Definition
| removing transmissions related to particular VLANs from a trunk to preserve bandwidth. |
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Term
| Spanning Tree Protocol (STP) |
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Definition
| In a network with multiple bridges there may be more than one path for a frame to take to its intended destination. Layer 2 broadcast traffic could continue to loop through a network with multiple paths indefinitely. A network protocol that builds a logical loop-free topology for Ethernet networks. The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them. |
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Term
| Power over Ethernet (PoE) |
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Definition
| a means of suppling electrical power from a switch port over ordinary data cabling to a connected powered device. |
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