READ Free Dumps For CISCO- 100-105
| Question ID 14554 | What happens when computers on a private network attempt to connect to the Internet
through a Cisco router running PAT?
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| Option A | The router uses the same IP address but a different TCP source port number for each connection.
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| Option B | An IP address is assigned based on the priority of the computer requesting the connection.
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| Option C | The router selects an address from a pool of one-to-one address mappings held in the lookup table.
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| Option D | The router assigns a unique IP address from a pool of legally registered addresses for the duration of the connection.
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| Correct Answer | A |
Explanation Reference: http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/nat_staticpat.html Static PAT translations allow a specific UDP or TCP port on a global address to be translated to a specific port on a local address. That is, both the address and the port numbers are translated. Static PAT is the same as static NAT, except that it enables you to specify the protocol (TCP or UDP) and port for the real and mapped addresses. Static PAT enables you to identify the same mapped address across many different static statements, provided that the port is different for each statement. You cannot use the same mapped address for multiple static NAT statements. Port Address Translation makes the PC connect to the Internet but using different TCP source port.
| Question ID 14555 | In the configuration of NAT, what does the keyword overload signify?
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| Option A | When bandwidth is insufficient, some hosts will not be allowed to access network translation.
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| Option B | The pool of IP addresses has been exhausted.
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| Option C | Multiple internal hosts will use one IP address to access external network resources.
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| Option D | If the number of available IP addresses is exceeded, excess traffic will use the specified address pool.
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| Correct Answer | C |
Explanation Explanation: The keyword overload used in the ip nat inside source list 1 pool ovrld overload example command allows NAT to translate multiple inside devices to the single address in the pool. The types of NAT include: Static address translation (static NAT)Allows one-to-one mapping between local and global addresses. Dynamic address translation (dynamic NAT)Maps unregistered IP addresses to registered IP addresses from a pool of registered IP addresses. OverloadingMaps multiple unregistered IP addresses to a single registered IP address (many to one) using different ports. This method is also known as Port Address Translation (PAT). By using overloading, thousands of users can be connected to the Internet by using only one real global IP address.