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DISCUSSION
Routers forward packets using either route information from route table entries that you manually
configure or the route information that is calculated using dynamic routing algorithms. Static
routes, which define explicit paths between two routers, cannot be automatically updated; you
must manually reconfigure static routes when network changes occur. Static routes use less
bandwidth than dynamic routes. No CPU cycles are used to calculate and analyze routing updates.
You can supplement dynamic routes with static routes where appropriate. You can redistribute
static routes into dynamic routing algorithms but you cannot redistribute routing information
calculated by dynamic routing algorithms into the static routing table. You should use static routes
in environments where network traffic is predictable and where the network design is simple. You
should not use static routes in large, constantly changing networks because static routes cannot
react to network changes. Most networks use dynamic routes to communicate between routers but
might have one or two static routes configured for special cases. Static routes are also useful for
specifying a gateway of last resort (a default router to which all unroutable packets are sent).
NETWORK TOPOLOGY
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SENT MESSAGES FROM END TO END
END DEVICES IP CONFIGURATION
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CONFIGURATION TABLE
Interface
IP Address
Subnet Mask
Default Gateway
RA
Fa 0/0
192.168.0.129
255.255.255.192/26
Se 0/1/0
192.168.0.225
255.255.255.252/30
RB
Fa 0/0
192.168.0.1
255.255.255.128/25
Se 0/0/0
192.168.0.226
255.255.255.252/30
Se 0/0/1
192.168.0.229
255.255.255.252/30
RC
Fa 0/0
192.168.0.193
255.255.255.224/27
Se 0/0/0
192.168.0230
255.255.255.252/30
PC A
192.168.0.130
255.255.255.192/26
192.168.0.129
PC B
192.168.0.2
255.255.255.128/25
192.168.0.1
PC C
192.168.0.194
255.255.255.224/27
192.168.0.193
CODES USED IN CLI
For router 0 (RA)
RA (config) # int s0/1/0
RA (config-ip) # ip add 192.168.0.225 255.255.255.252
RA (config-ip) # clock rate 64000
RA (config-ip) # no shut
RA (config-ip) # exit
RA (config) # int fa0/0
RA (config-ip) # ip add 192.168.0.129 255.255.255.192
RA (config-ip) # no shut
RA (config-ip) # exit
RA (config)# ip route 192.168.0.228 255.255.255.252 s0/1/0
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RA (config)# ip route 192.168.0.0 255.255.255.128 s0/1/0
RA (config)# ip route 192.168.0.192 255.255.255.224 s0/1/0
For router 1(RB)
RB (config) # int s0/0/0
RB (config-ip) # ip add 192.168.0.226 255.255.255.252
RB (config-ip) # no shut
RB (config-ip) # exit
RB (config) # int s0/0/1
RB (config-ip) # ip add 192.168.0.229 255.255.255.252
RB(config-ip) # clock rate 64000
RB (config-ip) # no shut
RB (config-ip) # exit
RB (config) # int fa0/0
RB (config-ip) # ip add 192.168.0.1 255.255.255.128
RB (config-ip) # no shut
RB (config-ip) # exit
RB (config)# ip route 192.168.0.128 255.255.255.128 s0/0/0
RB (config)# ip route 192.168.0.192 255.255.255.224 s0/0/1
For router 2 (RC)
RC (config) # int s0/0/0
RC (config-ip) # ip add 192.168.0.230 255.255.255.252
RC (config-ip) # no shut
RC (config-ip) # exit
RC (config) # int fa0/0
RC (config-ip) # ip add 192.168.0.193 255.255.255.224
RC (config-ip) # no shut
RC (config-ip) # exit
RC (config)# ip route 192.168.0.228 255.255.255.252 s0/0/0
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RC (config)# ip route 192.168.0.0 255.255.255.128 s0/0/0
RC (config)# ip route 192.168.0.128 255.255.255.192 s0/0/0

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DISCUSSION Routers forward packets using either route information from route table entries that you manually configure or the route information that is calculated using dynamic routing algorithms. Static routes, which define explicit paths between two routers, cannot be automatically updated; you must manually reconfigure static routes when network changes occur. Static routes use less bandwidth than dynamic routes. No CPU cycles are used to calculate and analyze routing updates. You can supplement dynamic routes with static routes where appropriate. You can redistribute static routes into dynamic routing algorithms but you cannot redistribute routing information calculated by dynamic routing algorithms into the static routing table. You should use static routes in environments where network traffic is predictable and where the network design is simple. You should not use static routes in large, constantly changing networks because static routes cannot react to network changes. Most networks use dynamic routes to communicate between routers but might have one or two static routes configured for special cases. Static routes are also useful for specifying a gateway of last resort (a default router to which all unroutable packets are sent). NETWORK TOPOLOGY SENT MESSAGES FROM END TO END END DEVICES IP CONFIGURATION CONFIGURATION TABLE Interface IP Address Subnet Mask Fa 0/0 192.168.0.129 255.255.255.192/26 Se 0/1/0 192.168.0.225 255.255.255.252/30 Fa 0/0 192.168.0.1 255.255.255.128/25 Se 0/0/0 192.168.0.226 255.255.255.252/30 Se 0/0/1 192.168.0.229 255.255.255.252/30 Fa 0/0 192.168.0.193 255.255.255.224/27 Se 0/0/0 192.168.0230 255.255.255.252/30 PC A 192.168.0.130 255.255.255.192/26 192.168.0.129 PC B 192.168.0.2 255.255.255.128/25 192.168.0.1 PC C 192.168.0.194 255.255.255.224/27 192.168.0.193 RA RB RC CODES USED IN CLI For router 0 (RA) RA (config) # int s0/1/0 RA (config-ip) # ip add 192.168.0.225 255.255.255.252 RA (config-ip) # clock rate 64000 RA (config-ip) # no shut RA (config-ip) # exit RA (config) # int fa0/0 RA (config-ip) # ip add 192.168.0.129 255.255.255.192 RA (config-ip) # no shut RA (config-ip) # exit RA (config)# ip route 192.168.0.228 255.255.255.252 s0/1/0 Default Gateway RA (config)# ip route 192.168.0.0 255.255.255.128 s0/1/0 RA (config)# ip route 192.168.0.192 255.255.255.224 s0/1/0 For router 1(RB) RB (config) # int s0/0/0 RB (config-ip) # ip add 192.168.0.226 255.255.255.252 RB (config-ip) # no shut RB (config-ip) # exit RB (config) # int s0/0/1 RB (config-ip) # ip add 192.168.0.229 255.255.255.252 RB(config-ip) # clock rate 64000 RB (config-ip) # no shut RB (config-ip) # exit RB (config) # int fa0/0 RB (config-ip) # ip add 192.168.0.1 255.255.255.128 RB (config-ip) # no shut RB (config-ip) # exit RB (config)# ip route 192.168.0.128 255.255.255.128 s0/0/0 RB (config)# ip route 192.168.0.192 255.255.255.224 s0/0/1 For router 2 (RC) RC (config) # int s0/0/0 RC (config-ip) # ip add 192.168.0.230 255.255.255.252 RC (config-ip) # no shut RC (config-ip) # exit RC (config) # int fa0/0 RC (config-ip) # ip add 192.168.0.193 255.255.255.224 RC (config-ip) # no shut RC (config-ip) # exit RC (config)# ip route 192.168.0.228 255.255.255.252 s0/0/0 RC (config)# ip route 192.168.0.0 255.255.255.128 s0/0/0 RC (config)# ip route 192.168.0.128 255.255.255.192 s0/0/0 Name: Description: ...
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