🪴 Notes

Cisco Labs (Lab 18)

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tagsacademic, networking
aliasesCisco Labs (Lab 18)

4 min read

For now I will focus on lab 18 for doing the full CLI task,

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While connecting DCE, be sure to connect R1 ISP first, which will be DCE, and R2 will be DTE.

Subnetting & Addressing plan (from 192.168.3.0/24)

For the requirements (two /27s for up to 28 hosts, a /28 for up to 14 hosts, a /28 for up to 7 hosts, and a point-to-point /30) we allocate:

  1. 1st subnet — existing Student LAN (up to 28 hosts)
    192.168.3.0 /27 → mask 255.255.255.224
    Usable: 192.168.3.1 .. 192.168.3.30 (broadcast .31)

  2. 2nd subnet — future Student LAN (up to 28 hosts, not used now)
    192.168.3.32 /27 → usable .33 .. .62

  3. 3rd subnet — existing ISP LAN (up to 14 hosts)
    192.168.3.64 /28 → mask 255.255.255.240
    Usable: 192.168.3.65 .. 192.168.3.78 (broadcast .79)

  4. 4th subnet — future ISP LAN (up to 7 hosts, not used now)
    192.168.3.80 /28 → usable .81 .. .94

  5. 5th subnet — existing WAN (point-to-point)
    192.168.3.96 /30 → mask 255.255.255.252
    Usable: 192.168.3.97 and 192.168.3.98 (broadcast .99)

Exact IP assignments (per your rules)

Existing Student LAN (192.168.3.0/27)

  • PC 1A (Fa0/1 on S1-Central): 192.168.3.1 mask 255.255.255.224
  • PC 1B (Fa0/2 on S1-Central): 192.168.3.2 mask 255.255.255.224
  • R2-Central Fa0/0 (gateway for student LAN) = highest usable = 192.168.3.30 mask 255.255.255.224
  • S1-Central management (VLAN1) = second-highest usable = 192.168.3.29 mask 255.255.255.224

Existing ISP LAN (192.168.3.64/28)

  • R1-ISP Fa0/0 = highest usable = 192.168.3.78 mask 255.255.255.240

  • Eagle_Server (server) = second-highest usable = 192.168.3.77 mask 255.255.255.240

    • Server default-gateway = 192.168.3.78

Existing WAN (192.168.3.96/30)

  • R2-Central S0/0/0 = lowest usable = 192.168.3.97 mask 255.255.255.252
  • R1-ISP S0/0/0 = highest usable = 192.168.3.98 mask 255.255.255.252

DNS server address (for PCs): 192.168.3.77 (the Eagle_Server)

And finally, the overral image is like,

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R1-ISP — full IOS config (type these on R1)

Make sure the display name in Packet Tracer for the device is R1-ISP and the hostname is set exactly as below.

R1-ISP> enable
R1-ISP# configure terminal
R1-ISP(config)# hostname R1-ISP
R1-ISP(config)# enable secret cisco
R1-ISP(config)# line console 0
R1-ISP(config-line)# password cisco
R1-ISP(config-line)# login
R1-ISP(config-line)# exit
R1-ISP(config)# line vty 0 4
R1-ISP(config-line)# password cisco
R1-ISP(config-line)# login
R1-ISP(config-line)# exit
R1-ISP(config)# banner motd this is lab router R1-ISP. Authorized access only.#

!— Interfaces
R1-ISP(config)# interface fastEthernet 0/0
R1-ISP(config-if)# ip address 192.168.3.78 255.255.255.240
R1-ISP(config-if)# no shutdown
R1-ISP(config-if)# exit

R1-ISP(config)# interface serial 0/0/0
R1-ISP(config-if)# ip address 192.168.3.98 255.255.255.252
R1-ISP(config-if)# clock rate 64000
R1-ISP(config-if)# no shutdown
R1-ISP(config-if)# exit

!— Static route to Student LAN via R2 serial IP
R1-ISP(config)# ip route 192.168.3.0 255.255.255.224 192.168.3.97

!— Save
R1-ISP(config)# exit
R1-ISP# copy running-config startup-config

R2-Central — full IOS config (type these on R2)

Set display name exactly R2-Central.

R2-Central> enable
R2-Central# configure terminal
R2-Central(config)# hostname R2-Central
R2-Central(config)# enable secret cisco
R2-Central(config)# line console 0
R2-Central(config-line)# password cisco
R2-Central(config-line)# login
R2-Central(config-line)# exit
R2-Central(config)# line vty 0 4
R2-Central(config-line)# password cisco
R2-Central(config-line)# login
R2-Central(config-line)# exit
R2-Central(config)# banner motd this is lab router R2-Central. Authorized access only.#

!— Interfaces
R2-Central(config)# interface fastEthernet 0/0
R2-Central(config-if)# ip address 192.168.3.30 255.255.255.224
R2-Central(config-if)# no shutdown
R2-Central(config-if)# exit

R2-Central(config)# interface serial 0/0/0
R2-Central(config-if)# ip address 192.168.3.97 255.255.255.252
R2-Central(config-if)# no shutdown
R2-Central(config-if)# exit

!— Default route (send everything to R1-ISP serial IP)
R2-Central(config)# ip route 0.0.0.0 0.0.0.0 192.168.3.98

!— Save
R2-Central(config)# exit
R2-Central# copy running-config startup-config

S1-Central (2960) — CLI config (type on the switch)

Make sure switch Display Name = S1-Central.

Switch> enable
Switch# configure terminal
Switch(config)# hostname S1-Central
S1-Central(config)# enable secret cisco
S1-Central(config)# line console 0
S1-Central(config-line)# password cisco
S1-Central(config-line)# login
S1-Central(config-line)# exit
S1-Central(config)# line vty 0 4
S1-Central(config-line)# password cisco
S1-Central(config-line)# login
S1-Central(config-line)# exit
S1-Central(config)# banner motd this is lab switch S1-Central. Authorized access only.#

!— Management interface
S1-Central(config)# interface vlan1
S1-Central(config-if)# ip address 192.168.3.29 255.255.255.224
S1-Central(config-if)# no shutdown
S1-Central(config-if)# exit

S1-Central(config)# ip default-gateway 192.168.3.30

!— Save
S1-Central(config)# exit
S1-Central# copy running-config startup-config

And testing phase…

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