Jeremy's IT Lab CCNA OSPF (Part 3) Day 28

Can routers with matching OSPF router IDs become neighbors?

No

Configure an OSPF password on an interface:

R1(config-if)# [...]

ip ospf authentication-key password

Configure the operating speed of a serial interface:

R1(config-if)# [...]

clock rate bits-per-second

Configure the OSPF network type of an interface:

R1(config-if)# [...]

ip ospf network type

Configure the PPP encapsulation on a serial interface:

R1(config-if)# [...]

encapsulation ppp

Disable the OSPF process on the router:

R1(config-router)# [...]

shutdown

Do OSPF Hello and Dead timers have to match for routers to become OSPF neighbors?

Yes

Enable OSPF authentication on an interface:

R1(config-if)# [...]

ip ospf authentication

If the IP [...] settings on the interfaces don't match, routers can become OSPF neighbors but won't move to the Full state.

MTU

If two routers have an OSPF network type mismatch, they will form an OSPF adjacency but won't [...].

learn OSPF routes

In the OSPF Broadcast network type, are a DR and BDR elected?

Yes

In the OSPF Broadcast network type, do routers dynamically discover neighbors?

Yes

In the OSPF Non-broadcast network type, do routers dynamically discover neighbors?

No

In the OSPF Point-to-point network type, are a DR and BDR elected?

No

In the OSPF Point-to-point network type, do routers dynamically discover neighbors?

Yes

Messages to the OSPF DR/BDR are multicast using address [...].

224.0.0.6

OSPF DR/BDR election order of priority:

1: [...]

2: Highest OSPF router ID

Highest OSPF interface priority

OSPF DR/BDR election order of priority:

1: Highest OSPF interface priority

2: [...]

Highest OSPF router ID

OSPF DROthers will only move to the Full state with [...].

the DR and BDR

OSPF DROthers will remain in the [...] neighbor state with other DROthers.

2-way

OSPF Non-broadcast network type default timers:

Hello: [...]

Dead: [...]

30 seconds

120 seconds

OSPF Type 1 LSA = [...] LSA

Router

OSPF Type 2 LSA = [...] LSA

Network

OSPF Type 5 LSA = [...] LSA

AS-External

OSPF Type [...] LSA = AS-External LSA

5

OSPF Type [...] LSA = Network LSA

2

OSPF Type [...] LSA = Router LSA

1

OSPF: In the Broadcast network type, routers which aren't the DR/BDR become a [...].

DROther

OSPF: The [...] network type is enabled on Ethernet and FDDI interfaces by default.

Broadcast

OSPF: The [...] network type is enabled on Frame Relay and X.25 interfaces by default.

Non-broadcast

OSPF: The [...] network type is enabled on PPP and HDLC interfaces by default.

Point-to-point

OSPF: The Broadcast network type is enabled on [...] and [...] interfaces by default.

Ethernet / FDDI

OSPF: The Non-broadcast network type is enabled on [...] and [...] interfaces by default.

Frame Relay / X.25

OSPF: The Point-to-point network type is enabled on [...] and [...] interfaces by default.

PPP / HDLC

Serial connection: The [...] side of the connection specifies the clock rate.

DCE

Serial connection: What does DCE stand for?

Data Communications Equipment

Serial connection: What does DTE stand for?

Data Terminal Equipment

Serial interfaces use the [...] encapsulation by default.

HDLC (cHDLC)

The default OSPF interface priority is [...] on all interfaces.

1

Which command can be used to check if a serial interface is DCE or DTE?

show controllers interface-id