IP Services - Network Address Translation
11 important questions on IP Services - Network Address Translation
What are 4 important NAT terms used often by Cisco and within the Cisco routers?
2. Inside Global: Public IP address representing one or more Inside Local IP addresses
3. Outside Local: The IP address of an outside host as it appears to the inside network
4. Outside Global: The actual IP address of the outside host.
What are three commonly used types of NAT?
2. Pooled NAT: Provides dynamic mapping of a local IP address to a Global IP address. After some idle time the Global IP is released back to the pool.
3. Port Address Translation (PAT): Provides a dynamic many local addresses to one global ip address mapping. This is done by mapping the local IP and source port to a unique combination of Global IP and source port so it knows where to send the return traffic.
What are the 3 steps to define Inside/source NAT?
2. Define inside interface with command ip nat inside
3. Define NAT rule with command ip nat inside source static inside-local-ip inside-global-ip
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How many sessions does a Static NAT Entry create in the NAT Translation Table?
In Pooled NAT, how do you specify the inside local (Source) ip address range?
In Pooled NAT, how do you specify the inside global (NATted Source) ip address range?
How many sessions does a Pooled NAT create in the NAT Translation Table?
If a data session is started a static session entry is created as well as a session entry per data session for that IP.
What happens when all the Inside Global addresses have been allocated to Inside Local addresses and a new Inside Local address tries to setup a session.
For how long are Inside Global addresses allocated to Inside Local addresses?
Port Address Translation creates the possibilty to map multiple Local IP addresses to one Global IP address by dynamically changing the source port. What is a different name for PAT?
What are the different command for Static NAT, Pooled NAT and PAT (NAT Overload)
2. Ip nat inside source list {acl-name} pool {pool-name}
3. Ip nat inside source list [interface {intf-id} | Pool {pool-name} overload
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