Section 18 Tasks
- Read IP addressing theory notes
- Take the subnetting exam below
- Complete today’s three NAT challenge labs
- Read the ICND1 cram guide
- Spend 15 minutes on the subnetting.org website
- Watch the network design videos on www.in60days.com
Section 18 Exam
- Which subnet is host 200.200.100.103/27 in?
- Which subnet is host 190.100.23.45/28 in?
- Which subnet is host 19.200.12.120/13 in?
- Which subnet is host 100.123.45.12/15 in?
- Which subnet is host 130.23.34.3/18 in?
- Network 192.168.1.0 needs subnetting to create three subnets, each with at least 20 hosts. Which subnet mask needs to be applied? (You need to watch the design videos first.)
- Network 200.100.1.0 needs subnetting to create five subnets, each with at least 30 hosts. Which subnet mask needs to be applied?
- Network 30.0.0.0 needs subnetting to create 200 subnets, with as many hosts as possible. Which subnet mask needs to be applied?
- Network 192.168.1.0 needs subnetting to create subnets that will contain only two hosts. Which subnet mask needs to be applied?
- Network 170.24.0.0 needs subnetting to create 100 subnets, each with at least 500 hosts. Which subnet mask needs to be applied?
Section 18 Answers
- 200.200.100.96
- 190.100.23.32
- 19.200.0.0
- 100.122.0.0
- 130.23.0.0
- 255.255.255.192
- 255.255.255.224
- 255.255.0.0
- 255.255.255.252
- 255.255.254.0
Section 18 Lab 1 – Static NAT
Topology
Instructions
Connect two routers together with a serial or crossover cable:
- Add IP addresses to the routers and a Loopback interface on Router A, according to the diagram; the 172 network can use the default subnet mask
- Designate NAT inside and outside interfaces
- Add a static route on Router B to send all traffic back to Router A
- Ping between Router A and Router B to test the serial line (remember clock rates)
- Create a static NAT for 172.16.1.1 to 10.1.1.1 and turn on NAT debugging
- Do an extended ping source from Loopback 0
- Check the NAT translation table
Solution Hints and Commands
- ip nat inside command and ip nat outside command on the interfaces
- ip route global configuration command to add static route
- Static NAT: ip nat inside source static x.x.x.x y.y.y.y command
- show ip nat translations command to check the NAT translation table
Section 18 Lab 2 – NAT Pool
Topology
Instructions
Connect two routers together with a serial or crossover cable:
- Add IP addresses to the routers and a Loopback interface on Router A, according to the diagram
- Designate NAT inside and outside interfaces
- Add a static route on Router B to send all traffic back to Router A
- Ping between Router A and Router B to test the serial line (remember clock rates)
- Create a NAT pool of 10.1.1.1 to 10, inclusive
- Create two ACL lines to permit the Loopback networks (/16)
- Configure the NAT pool, using the defined pool and ACL
- Turn on NAT debugging
- Source two extended pings, one each from L0 and L1
- Check the NAT translation table
Solution Hints and Commands
- ip nat inside command and ip nat outside command on the interfaces
- ip route global configuration command to add static route
- ip nat pool name <start_ip> <end_ip> netmask <mask> command
- access-list x permit y.y.y.y command
- ip nat inside source list x pool <name> command
- debug ip nat [detailed] command
- show ip nat translations command to check the NAT translation table
Section 18 Lab 3 – NAT Overload
Topology
Instructions
Connect two routers together with a serial or crossover cable:
- Add IP addresses to the routers and a Loopback interface on Router A, according to the diagram
- Designate NAT inside and outside interfaces
- Add a static route on Router B to send all traffic back to Router A
- Ping between Router A and Router B to test the serial line (remember clock rates)
- Create a NAT pool of address 10.1.1.1 only and overload this pool (address)
- Create two ACL lines to permit the Loopback networks (/16)
- Configure NAT overload using the defined pool and ACL
- Turn on NAT debugging
- Source two extended pings, one each from L0 and L1
- Check the NAT translation table
Solution Hints and Commands
- Hint: Router(config)#ip nat pool <name> 10.1.1.1 10.1.1.1 prefix-length 24 command
- ip nat inside source list x pool <name> overload command