Ccna 00-301, Volume Official


Chapter 3: Fundamentals of WANs and IP Routing    75 Subnet Interface Next Hop 150.150.4.0



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CCNA 200-301 Vol 1&2

3

Chapter 3: Fundamentals of WANs and IP Routing    75

Subnet

Interface Next Hop



150.150.4.0 Serial0

150.150.2.7

R1 Routing Table

Subnet


Interface Next Hop

150.150.4.0 FastEth0/0

150.150.3.1

R2 Routing Table

G0/0


S0

150.150.2.7

150.150.3.1

150.150.4.10



F0/0

C

A



E

F

D



Subnet

Interface Next Hop



150.150.4.0 Gigabit0/0 N/A

R3 Routing Table

B

R2



R3

PC1


PC2

PC11


R1

Subnet

150.150.4.0

Figure 3-13

  Example of How Routing Protocols Advertise About Networks and Subnets

Follow items A through F shown in the figure to see how each router learns its route to 

150.150.4.0. 

Step A.

  Subnet 150.150.4.0 exists as a subnet at the bottom of the figure, connected to 

Router R3.

Step B.

  R3 adds a connected route for 150.150.4.0 to its IP routing table; this happens 

without help from the routing protocol.

Step C.

  R3 sends a routing protocol message, called a routing update, to R2, causing 

R2 to learn about subnet 150.150.4.0.

Step D.

  R2 adds a route for subnet 150.150.4.0 to its routing table.



Step E.

  R2 sends a similar routing update to R1, causing R1 to learn about subnet 

150.150.4.0.

Step F.

 

R1 adds a route for subnet 150.150.4.0 to its routing table. The route lists R1’s 



own Serial0 as the outgoing interface and R2 as the next-hop router IP address 

(150.150.2.7).




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