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Q1. What is the neighbor list
For Answer: Each router OSPF uses a list of neighbors to follow their neighbors discovered their countries that DR / BDR elected
For Q2 .. Using
For? Answer: When the router floods Hello, this means the neighbors of the current list of sexually transmitted infections in neighboring countries, including the neighbor list in Hello packets. When the receiver router Hello packet, it starts the following update: Add To
router sends to the neighbor list.
For? Change in the neighboring country of 2 highways if neighbor list includes the name of Hello recipient.
For? Router to router, ie sending OSPF Router ID and priority. It elected the DR and BDR.
for Q3. When the receiver router Hello, are added to the list of all routers Hello neighbors than their neighbors
For Answer: no. He added that the sending node as a neighbor Hello. OSPF neighbors are directly connected by a link or subnet multiaccessing,
For Q4:. What is 2 –
For Answer: When the receiver sees the router name in Hi and Hi is the list of neighbors, then the sender’s neighbor 2 receiver. How ever, the sender can not be treated as a neighbor and receiver in both directions. For
Q5. ? What are the steps to bring two neighboring nodes 2 to another
For Answer: Consider a simple topographies of: R1 to R2 is connected
For 1 … Hi R2 to R1 road with an empty list.
2. Hello from the receiver R2 R1. It adds ITS neighbor R1. R1 R2 treats a neighbor as unidirectional.
3. Path to R2 with a neighbor, Hi This list contains R1.
4. Hello from the receiver R2 R1. R1 sees his name in the list Hello neighbor. R2 adds R1 R2 and treatment of sexually transmitted infections such as neighbor list in two ways. For
5. Hello again to route R2 R1. This time, Hello contains the list of neighbors R2. For
6. Hello from the receiver R2 R1. It shows the list of Bonjour. 2-state R1 R2 change of tone. For
After two rounds of floods Hello, R1 and R2 become 2-way neighbors. For
Q6. Why is it so important 2 –
For Answer To correctly calculate the shortest paths, OSPF routers must receive the same knowledge of network topology. To achieve this, OSPF LSDB synchronizer for all routers. The starting point of this method to synchronize 2 is the relationship between the two neighbors. With 2-way, two neighbors can start sharing LSASS synchronize their LSDB. For
Q7. D – Dr. elections, how 2-way connections are established in the attached subnet routers
For No answer: N * (N-1) / 2. For example, the subnet router 4 has six bidirectional links (4 * 3/2 = 6). In the 10 subnet router has 45 bidirectional links (10 * 9/2 = 45)
Q8. What are the election rules
For Answer “. 9.4 The Designated Router election” RFC 2328 defines full electoral rules. Simplified version
To 1. Only non-zero priority routers are elected.
2. Only neighboring routers are 2-way/full, eligible for election.
3. Eligible lists routers in group 3 or DR
For a list of candidates. For example, routers as DR, which won the Hi.
For a list of candidates or BDR. For example, routers as BDR in earning Hello
for or eligible. Routers are not as DR or BDR in Hi.
4. BDR chooses first. BDR list of candidates, selecting the highest priority router as BDR. In the event of a tie, the highest elected RID. If the candidate list is empty BDR, then selects the router with the highest priority of the RID of the eligible list. If the eligible list is empty, then BDR could not be completed. For
5. Select DR. The list of candidate-DR, the router will choose the highest priority that Dr.. In the event of a tie, the highest elected RID. If the candidate list is empty DR and DR and BDR elected promotion has just elected the new BDR. For
6. If the router is the DR / BDR after the title, but lost his re-election this time was returned to the list of eligible. For
This article is a simulation of OSPF Questions and Answers. Hello simulation Anime neighboring lists changes and flooding. It helps readers to visualize the DR election, before you read the manual or RFC.2328 (OSPF 2) in external links for more information
For OSPF network simulation
To 1. Simulation OSPF: DR election (article) <= target of "_new" REL = "Nofollow"
2. The list of OSPF simulation (content): <= target of "_new" relevant = "Nofollow"
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