lab 7-1...

this is not pretty...

branch

int lo0
des branch lan
ip add 192.168.1.1 255.255.255.0

int s1/1
des connect to isp
ip add 209.165.200.242 255.255.255.248
band 64
no shut

ip route 0.0.0.0 0.0.0.0 209.165.200.241

hq

int lo0
des hq lan
ip add 10.10.10.1 255.255.255.0

int s1/2
des connect to isp
ip add 209.165.200.226 255.255.255.248
clock rat 64000
band 64
no shut

ip route 0.0.0.0 0.0.0.0 209.165.200.225

isp

int lo0
des imaginary inet
ip add 209.165.202.129 255.255.255.240

int s1/1
des connect to branch
ip add 209.165.200.241 255.255.255.248
clock rat 64000
band 64
no shut

int s1/2
des connect to hq
ip add 209.165.200.225 255.255.255.248
band 64
no shut

ip route 209.165.200.232 255.255.255.248 s1/2
ip route 209.165.200.248 255.255.255.248 s1/1

isp#sh ip int brie
Interface              IP-Address      OK? Method Status                Protocol
FastEthernet0/0        unassigned      YES unset  administratively down down   
FastEthernet0/1        unassigned      YES unset  administratively down down   
Serial1/0              unassigned      YES unset  administratively down down   
Serial1/1              209.165.200.241 YES manual up                    up     
Serial1/2              209.165.200.225 YES manual up                    up     
Serial1/3              unassigned      YES unset  administratively down down   
Loopback0              209.165.202.129 YES manual up                    up     
isp#ping 209.165.200.242
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 209.165.200.242, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/8/20 ms
isp#sh cdp neigh
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
                  D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
branch           Ser 1/1           173               R    7206VXR   Ser 1/1
hq               Ser 1/2           128               R    7206VXR   Ser 1/2

foreach address {
209.165.200.241
209.165.202.129
209.165.200.226
} { ping $address }

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 209.165.200.241, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/7/12 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 209.165.202.129, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 209.165.200.226, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/9/12 ms