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

Dán dòng lệnh này vào terminal của bạn:

Mật khẩu để kết nối là

Xin hãy trả lời tất cả các câu hỏi. Lỗi nội tại hệ thống {} has not a valid extension. {} is too heavy.

Câu hỏi 1: Passive interface

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

The router stops sending Hellos on that interface

Disables OSPFv3 on the interface entirely

Drops all OSPFv3 packets received

Câu hỏi 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

R1 only

Both R2 and R3, with ECMP load balancing

Câu hỏi 3: What is the MTU?

What does the MTU represent?

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

The Hello interval used to maintain adjacencies

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

Câu hỏi 4: Stuck in ExStart

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

Different OSPF areas

Duplicate router-id

MTU mismatch on the link

One side is passive

Câu hỏi 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 reaches Full but routes are missing

Adjacency flaps every dead interval

Neighbor stuck in ExStart/Exchange

Hellos are never exchanged

Tác giả	Noah Van Horenbeke
Hạn chót	Không có hạn chót
Giới hạn nộp bài	Không có giới hạn

Thông tin

Đăng nhập

0 - OSPF QCM

Câu hỏi 1: Passive interface

Câu hỏi 2: Cost and path selection

Câu hỏi 3: What is the MTU?

Câu hỏi 4: Stuck in ExStart

Câu hỏi 5: MTU mismatch symptom

Thông tin

Đăng nhập

0 - OSPF QCM Thu gọn bối cảnh

Câu hỏi 1: Passive interface

Câu hỏi 2: Cost and path selection

Câu hỏi 3: What is the MTU?

Câu hỏi 4: Stuck in ExStart

Câu hỏi 5: MTU mismatch symptom

0 - OSPF QCM