CP Route v1 Vocabulary Ch06

Question 1

ALL DR multicast

Answer 1

the multicast IP address 224.0.0.6, listened for by DRs and BDRs

Question 2

All SPF Routers multicast

Answer 2

the multicast IP address 224.0.0.5 listend for by all OSPF routers

Question 3

Backup Designated Router (BDR)

Answer 3

in OSPF, a router that is prepared to take over the designated router

Question 4

Database Description packet (DD)

Answer 4

a type of OSPF packet used to exchange and acknowledge LSA headers; sometimes called DBD

Question 5

Designated Router (DR)

Answer 5

on multiaccess data links such as LANs, an OSPF router elected by the routers on that link to perform special functions, including the generation of LSAs representing the subnet and playing a key role in the database exchange process

Question 6

Internal Router

Answer 6

an OSPF router that has interface connected to only 1 area, making the router completely internal to that one area

Question 7

Link State Acknowledgement (LSAck) packet

Answer 7

a type of OSPF packet used to acknowledge LSU packets

Question 8

Link State Advertisement (LSA)

Answer 8

the name of a class of OSPF data structures that hold topology information; held in memory in the LSDB and communicated over the network in LSU messages

Question 9

Link State Identifier (LSID)

Answer 9

a 32-bit number used to uniquely identify an OSPF LSA

Question 10

Link State Request (LSR) packet

Answer 10

an OSPF packet used to ask a neighboring router to send a particular LSA

Question 11

Link State Update (LSU) packet

Answer 11

the name of the OSPF packet that holds the detailed topology information, specifically LSAs

Question 12

Network LSA

Answer 12

OSPF LSA Type 2

Question 13

Reference bandwidth

Answer 13

in OSPF, the numerator in the calculation of interface cost; the formula is reference-bandwidth / interface-bandwidth

Question 14

Router LSA

Answer 14

another name for an OSPF Type 1 LSA

Question 15

SPF calculation

Answer 15

the process of running the SPF algorithm against the OSPF LSDB, with the result being the determination of the current best route(s) to each subnet

Question 16

Summary LSA

Answer 16

another name for an OSPF Type 3 LSA

Question 17

Type 1 LSA

Answer 17

An OSPF LSA type that describes a router; it lists the router’s OSPF ID, its interfaces, their states, and the Link State IDs of neighboring LSAs

Question 18

Type 2 LSA

Answer 18

An OSPF LSA type that describes a multiaccess network on which a DR has been elected and for which at least 1 other router connects; this LSA represents the subnet; also called a network LSA

Question 19

Type 3 LSA

Answer 19

An OSPF LSA type that describes a subnet in another area; also called a summary LSA