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Routing Midterm > Chapter 2-8: OSPF > Flashcards

Chapter 2-8: OSPF Flashcards

1
Q

What is OSPF (open Short Path First)?

A

It uses a link state routing algorithm and falls into the group of interior routing protocols, operating within a single autonomous system (AS).

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2
Q

What are six [6] features of OSPF

A
  1. Classless - supports VLSM & CIDR.
  2. Efficient – triggered updates (not periodic), uses SPF.
  3. Fast convergence
  4. Scalable
  5. Secure - supports encrypted updates when config’d
  6. AD = 110
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3
Q

What are three [3] components of OSPF?

A
  1. Data Structure
  2. Routing packets
  3. Dijkstra’s SPF alogorithm
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4
Q

What are four [4] data structures of the OSPF

A
  1. Creates & maintains three DBs:
  2. Adjacency DB -> neighbor table
  3. Link-state DB (LSDB) -> topology table
  4. Forwarding DB -> routing table
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5
Q

What is a Single-Area OSPF?

A

smaller networks; usually area 0

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6
Q

What is a Multiarea OSPF?

A

Multi-Area – 2-layer hierarchy – larger networks

All areas must connect to area 0

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7
Q

What is ABR (Area Border Routers)?

A

Interconnect routers are Area Border routers

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8
Q

What are Hello Packets Intervals?

A

Every 10 sec (default multiaccess & P2P)

Every 30 sec (default NBMA) (non-broadcast multiple access)

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9
Q

What is a Dead interval?

A

period router waits before declaring neighbor down

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10
Q

Hello packets are transmitted to what IPV4 address?

A

224.0.0.5

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11
Q

Hello packets are transmitted to what IPV6 address?

A

FF02::5
FF02::6

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12
Q

What happens after a dead interval occurs?

A

default is 4 Hello interval

floods LSDB about dead neighbor out all OSPF interfaces

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13
Q

What are the five [5] OSPF Packet Types

A
  1. Hello
  2. DBD (Database Description)
  3. LSR (Link-State Request)
  4. LSU (Link-State Update)
  5. LSAck (Link-State Acknowledgement)
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14
Q

What is the 7 state of OSPF?

A
  1. Down
  2. Initiate
  3. 2-Way
  4. Ex-Start
  5. Exchange
  6. Loading
  7. Full
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15
Q

What is the Password Recovery process?

A

Do a hard Reset (Switch on and Off)
Ctrl + Break
Type confreg 0x2142

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16
Q

What are the three [3] orders of Router ID

A
  1. 32 bit dotted decimal
  2. highest loopback IP address
  3. highest active IP address

Routing Midterm (8 decks)

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