【Answer】1. B 2. A, B, C, D 3. D 4. A 5. A, B, C, D
【Winner】MahMush，Rumana，umaryaqub，yogijain，Vien
-------------------
Hello, everyone!
Join the Community Learning week Network Routing&Switching OSPF topic!
Network class learning time of this phase: April 19th - April 24th.
Answer time of this class: April 19th, 2 AM - April 20th, 10 AM (UTC+0)
Class topic
Post 1. OSPF summary and concept
As the well-known link-state routing protocol, OSPF is a link-state routing protocol, which means, unlike distance vector routing protocol, it spreads link state advertisement instead of routing information. All the routers in the same area will maintain the same LSDB(link-state database)... More
Post 2. OSPF link types
In addition to defining the network type, OSPF also defines the link type, which is two different concepts. Link types are primarily used to describe the interfaces or neighbors of an OSPF router... More
Post 3. Introduction of the OSPF detailed LSAs
After the LSDB built up, the router can calculate the route path based on LSDB which includes multi types of LSA. From type 1 LSA to type 7 LSA, every type of LSA generated by different routers, and carries different link state messages... More
Post 4. OSPF external route cost and route selection
When OSPF imports external routes, the default cost is set to 1. For the same OSPF process, Type-1 external routes are preferred to type-2 external routes. For two Type-2 external routes, Compare the external cost... More
Post 5. HCIE Interview question – Typical Reasons for OSPF Neighbor Problems
Typical reasons for OSPF neighbor down usually include router-ID confliction, area-ID mismatch, authentication mismatch, hello/dead interval mismatch... More
Class Questions
After attending this class, please answer the following questions and comment with the answers below this post.
1. In OSPF, there are two multicast IP addresses, 224.0.0.5 and 224.0.0.6. DR and BDR listen to multicast address 224.0.0.5, DRother listens to multicast address 224.0.0.6.
A. True
B. False
2. (Multiple-Choices Question)Which of the following are OSPF link types?
A. Stubnet
B. TransNet
C. Point-to-Point
D. Virtual Link
3. What types of LSAs exist in an NSSA?
A. 1,2,3
B. 1,2,3,4
C. 1,2,3,4,5
D. 1,2,3,7
4. What are OSPF route selection principles?
A. Intra-area route > Inter-area route > TYPE1 route > TYPE2 route
B. Intra-area route > Inter-area route > TYPE2 route > TYPE1 route
C. Inter-area route > Intra-area route > TYPE2 route > TYPE1 route
D. Intra-area route > TYPE1 route > Inter-area route > TYPE2 route
5. (Multiple-Choices Question)Which of the following factors affect the establishment of OSPF neighbor relationships?
A. Router ID
B. Network type
C. MTU
D. Silence Interface
Hope you get good grades, come and enjoy this learning party! 
Click to learn: >>> Next class-Transmission Ethernet Basics
