0 - OSPF QCM - Noah Van Horenbeke - TFE

This QCM will help you understand the next exercises by ensuring you understand the specific characteristics of OSPFv3.

Documentation:

FRRouting OSPFv3: https://docs.frrouting.org/en/latest/ospf6d.html
RFC 5340 (OSPF for IPv6): https://datatracker.ietf.org/doc/rfc5340/
Cisco : OSPF MTU mismatch behaviour: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/119384-technote-ospf-00.html

Copia este comando en tu terminal:

La contraseña correcta es

Responda a todas las preguntas. Error interno {} no tiene una extensión válida. {} es muy pesado.

Pregunta 1: Passive interface

In FRRouting, what is the effect of marking an OSPFv3 interface as passive?

Drops all OSPFv3 packets received

Disables OSPFv3 on the interface entirely

The router stops sending Hellos on that interface

Pregunta 2: Cost and path selection

R1 has two possible paths to reach the prefix announced by R5:

via R2, with a total cost of 20
via R3, with a total cost of 30

Which next-hop(s) will R1 install in its routing table for that prefix?

Neither

R2 only

Both R2 and R3, with ECMP load balancing

R1 only

Pregunta 3: What is the MTU?

What does the MTU represent?

The metric used by SPF to compute the shortest path

The maximum number of OSPF neighbors allowed on each node's interface within a single area

The Hello interval used to maintain adjacencies

The maximum size (in bytes) of an IP packet the interface can transmit without fragmentation

Pregunta 4: Stuck in ExStart

Two OSPFv3 neighbors remain stuck in ExStart/Exchange and never reach Full. What is the most likely cause?

One side is passive

Different OSPF areas

MTU mismatch on the link

Duplicate router-id

Pregunta 5: MTU mismatch symptom

Two OSPFv3 routers on the same link have different interface MTUs.

What do you observe?

(See the Cisco note linked above for details on this behaviour.)

Adjacency flaps every dead interval

Neighbor stuck in ExStart/Exchange

Adjacency reaches Full but routes are missing

Hellos are never exchanged

Autor(es)	Noah Van Horenbeke
Fecha de entrega	Sin fecha de envío
Tiempo límite de envío	Sin límite de envío

Información

Inicia sesión

0 - OSPF QCM

Pregunta 1: Passive interface

Pregunta 2: Cost and path selection

Pregunta 3: What is the MTU?

Pregunta 4: Stuck in ExStart

Pregunta 5: MTU mismatch symptom

Información

Inicia sesión

0 - OSPF QCM Ver más sobre el contexto

Pregunta 1: Passive interface

Pregunta 2: Cost and path selection

Pregunta 3: What is the MTU?

Pregunta 4: Stuck in ExStart

Pregunta 5: MTU mismatch symptom

0 - OSPF QCM