MODULE 6 Section 2 Flashcards
(18 cards)
IS-IS OSI Network Addressing:
- > IS-IS uses _____ addressing (___ ______) compared to another IP routing protocol.
- > Each address identifies the _____,_____ and ____
- > Routers with common area form _______
- > Routers with different area form ________
IS-IS OSI Network Addressing:
- > IS-IS uses unique addressing (OSI addresses) compared to another IP routing protocol
- > Each address identifies the area, system and selector
- > Router with common area form L1 and/or L2 adjacencies if capable
- > Router with different area form L2 adjacencies if capable
- > 2 layer hierarchy:
- > L1 Build the __________ and forwards traffic to other areas through the __________ router
- > L2 Exchanges _________ and forwards traffic _________
- > 2 layer hierarchy:
- > L1 Build the local area topology and forwards traffic to other areas through the nearest L1/L2 router
- > L2 Exchanges prefix information and forwards traffic between areas
NSAP addressing:
___________+_________________________
IDP: initial domain part
DSP: domain specific part
NSAP addressing:
IDP = ______+_______
AFI: Authority and format identifier
IDI: Initial domain identifier
NSAP addressing:
DSP = ______________+_____+_____
High order-DSP
System ID
NSEL
Each address identifies a ___ of _____ to the network, such as ____ ____, and is called an NSAP. An end system can have _____ NSAP addresses, in which case the addresses differ only by the __ ___ (called the ____) Each NSAP represents a ___ that is available at that node, In addition to having multiple services, a single node can belong to ___ ___
Each address identifies a point of connection to the network, such as router interface, and is called an NSAP. An end system can have multiple NSAP addresses, in which case the addresses differ only by the last byte (called the selector) Each NSAP represents a service that is available at that node, In addition to having multiple services, a single node can belong to multiple areas
AFI:
Indicates the type of ___ through which the address was assigned and the _____ ____, including the ____ of the _________.The AFI is always _____ in length
AFI:
Indicates the type of authority through which the address was assigned and the format of the address, including the length of the variable Initial Domain Identifier.The AFI is always one byte in length
Common AFI:
- > 49 _________ (not registered with any national or international authority)
- > 47 _______ - ____
- > 39 ________ - address issued by ________, such as ___
Common AFI:
- > 49 Privately assigned (not registered with any national or international authority)
- > 47 International authority - ISO
- > 39 Single country authority - address issued by national standards bodies, such as ANSI
Initial Domain Identifier
_______ number that identifies the ______ that assigned the domain identifier.
Initial Domain Identifier
Variable length number that identifies the authority that assigned the domain identifier
High order-Domain Specific Part (HO-DSP)
->Allows the _____ of addresses within the routing domain. The number indicates which ______ within the routing domain assigned the address
High order-Domain Specific Part (HO-DSP)
->Allows the delegation of addresses within the routing domain. The number indicates which subauthority within the routing domain assigned the address
System Identifier
Identifies a ___ __ ____, generally in the form of ___ ___________
System Identifier
Identifies a particular end system, generally in the form of 48-bit media access control MAC addresses
NSAP Selector
___ which ____ on the end system is ______ in this packet. Allow several types of traffic to be multiplexed over one pair of addresses
NSAP Selector
Indicates which service on the end system is interested in this packet. Allow several types of traffic to be multiplexed over one pair of addresses
NSEL
An address with an N selector of 00 is called a ______ _____ _____
Any packet received with an N selector of 00 are processed by the____ ____ _____ ___
NSEL
An address with an N selector of 00 os called a Network Entity Title
Any packet received with an N selector of 00 are processed by the routing IS-IS software itself
Simplified NSAP addressing
Area ID = ___ + ____ + _______
Simplified NSAP addressing
Area ID = AFI + IDI +HO-DSP
Rules of NSAP
Level 1 routers _____ the area ID and communicate using the ______. Keep in mind that L1 routers only communicate with other __ or ____ routers ____ their area; therefore, the area ID is always the same for all L1 routers within an area. The only way to differentiate one router from another is with the system ID.
Rules of NSAP
Level 1 routers ignore the area ID and communicate using the system ID. Keep in mind that L1 routers only communicate with other L1 or L1/L2 routers within their area; therefore, the area ID is always the same for all L1 routers within an area. The only way to differentiate one router from another is with the system ID.
Level 2 routers communicate with other __ or ____ routers ________. L2 routers are concerned with ________, instead of ____ an area. They keep track of their neighbors using the area ID and not the system ID.
Level 2 routers communicate with other L2 or L1/L2 routers between areas. L2 routers are concerned with routing between areas, instead of within an area. They keep track of their neighbors using the area ID and not the system ID.
No two routers in the topology can have the same ____ address — this would cause routing confusion.
No two routers in the topology can have the same NSAP address — this would cause routing confusion.
The AFI should always be set to ___. This value indicates that a ________ _____ _______ the topology.
The concept is similar to a private IP address.
The AFI should always be set to 0x49. This value indicates that a local administrator configured the topology.
The concept is similar to a private IP address.
