A field in the IP header that identifies the type of header that follows the IP header,typically a Layer 4 header,such as TCP or UDP.ACLs can examine the protocol type to match packets with a particular value in this header field.
Permanent Virtual Circuit. A predefined VC.A PVC can be equated to a leased line in concept.
An ITU-T specification for the ISDN User-Network Interface 9UNI) data link layer.
An ITU-T specification for signaling to establish,maintain,and clear ISDN network connections.
Reference point :
An ISDN term that refers to the various interfaces between ISDN devices that implement different ISDN function groups.
Routing Information Protocol.An Interior Gateway Protocol (IGP) supplied with UNIX Berkeley Standard Distribution (BSD)systems.Rip is the most common IGP in the Internet.It uses hop count as a routing metric.
Root bridge :
A bridge That exchanges topology information with designated bridges in a spanning-tree implementation to notify all other bridges in the network when topology changes are required.
Route summarization :
A consolidation of advertise address which causes a single summary route to be advertised.
Rapid Spanning Tree Protocol,defined in IEEE 802.1w,defines an improved version of STP that converges much more quickly and consistently than STP (802.1d).
Static-length subnet mask.The usage of the same subnet mask for all subnets of a single Class A,B,or C network.
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