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Consider a network having 6 routers P to U connected with links having weights as shown below:
All routers are using distance vector routing algorithm to update their routing table. Then what will be the shortest distance between router P and router U?
  • a)
    3
  • b)
    6
  • c)
    4
  • d)
    8
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Consider a network having 6 routers P to U connected with links having...
There are various routes possible from P to U.
First route from P to U is:
1. P → S → U: COST = 4 + 2 = 6
2. P → R → U:  COST = 1 + 2 = 3
3. P → R → S → U: COST = 1 + 1 + 2 =  4
4. P → R → T → U: COST = 1+ 8 + 3 = 12
5. P → Q → T → U: COST = 3 + 6 + 3 = 12
6. P → Q → R → U: COST = 3 + 7 + 2 = 12
7. P → Q → R → T → U: COST = 3 + 7 + 8 + 3 = 21
So, minimum cost is 3. Shortest route from P to U is 3.
Hence, the correct option is (A).
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Community Answer
Consider a network having 6 routers P to U connected with links having...
There are various routes possible from P to U.
First route from P to U is:
1. P → S → U: COST = 4 + 2 = 6
2. P → R → U:  COST = 1 + 2 = 3
3. P → R → S → U: COST = 1 + 1 + 2 =  4
4. P → R → T → U: COST = 1+ 8 + 3 = 12
5. P → Q → T → U: COST = 3 + 6 + 3 = 12
6. P → Q → R → U: COST = 3 + 7 + 2 = 12
7. P → Q → R → T → U: COST = 3 + 7 + 8 + 3 = 21
So, minimum cost is 3. Shortest route from P to U is 3.
Hence, the correct option is (A).
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