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Topic: NAT, PBR & IP ServicesSwitch
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3.0 Infrastructure

NAT, PBR & IP Services Practice Questions

NAT/PAT, Policy-Based Routing route-maps, and NTP stratum hierarchy.

One solved question, so you can see how these are marked

In Cisco NAT terminology, what is the term for the IP address of an inside host as it appears to the external outside network?

Inside Global

Inside Global is the public/routable IP address representing an internal host to the external world after NAT conversion.

Every question in the set below is marked like this. The answers stay hidden until you pick one.

All 6 NAT, PBR & IP Services questions in this set

Answers and explanations appear when you work through the set above.

  1. When deploying Policy-Based Routing (PBR) on a router interface, which command applies the route-map to incoming interface traffic?

    • ip policy route-map <MAP-NAME>
    • ip route-cache policy
    • service-policy input <MAP-NAME>
    • ip local policy route-map <MAP-NAME>

  2. Which command sets up Port Address Translation (PAT) using a single public router interface IP address?

    • ip nat inside source list 1 pool PUBLIC overload
    • ip nat inside source list 1 interface GigabitEthernet0/0 overload
    • ip nat inside source static 192.168.1.1 interface GigabitEthernet0/0
    • ip nat pool PUBLIC 203.0.113.1 203.0.113.1 netmask 255.255.255.0

  3. What happens to a packet matching a Policy-Based Routing (PBR) route-map sequence if the specified set ip next-hop IP address is unreachable in the routing table?

    • The packet is immediately dropped by the router CPU.
    • The packet falls back to normal destination-based routing table lookup.
    • The router sends an ICMP destination unreachable message back to the sender.
    • The packet is held in a buffer queue for 30 seconds.

  4. Which configuration command maps inbound TCP port 80 traffic destined for public IP 203.0.113.10 to an internal web server at 192.168.1.50?

    • ip nat inside source static tcp 192.168.1.50 80 203.0.113.10 80
    • ip nat outside source static tcp 203.0.113.10 80 192.168.1.50 80
    • ip nat pool WEB 192.168.1.50 203.0.113.10 port 80
    • ip nat inside source list 1 interface Gig0/0 overload

  5. What configuration step is required to apply a completed PBR policy route-map to an incoming router interface?

    • ip policy route-map <MAP_NAME> on the target interface
    • ip local policy route-map <MAP_NAME> in global configuration
    • redistribute static route-map <MAP_NAME> under the routing protocol
    • service-policy input <MAP_NAME> on the target interface

  6. What type of NAT allows multiple internal private hosts to share a single public IP address by mapping unique source port numbers to each connection?

    • Static NAT with a one-to-one fixed mapping
    • Dynamic NAT using a pool without overload
    • Port Address Translation (PAT) / NAT Overload
    • Identity NAT (address translated to itself)