Chapter 13 - Understanding Frame Relay Concepts Flashcards
What solutions were created to compensate for the lack of a protocol type field in the standard frame relay header?
- Cisco and other companies created an additional header. A 2-byte protocol type field which comes between the LAPF and layer 3 packet.
- RFC 1490 mutiprotocol interconnect over frame relay. This RFC defines a similar header also placed between the LAPF header and layer 3 packet.
What are frame relay addresses called?
Data link connection identifiers - DLCI
True or False. The local DLCIs on a single access link don’t have to be unique.
False. The DLCIs must be unique among all PVCs that use one frame relay access link.
What are 3 different options for assigning subnets and IP addresses on frame relay interfaces?
- One subnet containing all frame relay DTEs
- One subnet per VC
- A hybrid of the first two options
What is a VC?
Virtual circuit
What is a PVC?
Permanent virtual circuit
What is SVC?
Switched virtual circuit. An Example is a dial connection.
What is AR?
Speed at which the access link is clocked.
What is CIR?
Speed at which bits can be sent over VC according to the business contract between the customer and provider.
What does NBMA stand for?
Non-broadcast multi-access
What are the 3 frame relay LMI types?
Cisco, ANSI, and ITU