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You issue the show running-config command on a CME router and receive the following partial output:
Examine the output, and use the information you gather to answer the question.
Which of the following commands could be issued in place of the forward-digits 3command to enable users to dial all N11 numbers? (Choose two.)
- forward-digits all
- digit-strip
- no digit-strip
- prefix [2-9]
- forward-digits .11
Explanation:
You could issue the no digit-strip command or the forward-digits all command instead of the forward-digits 3 command to enable the router to forward N11 service calls to the public switched telephone network (PSTN). N11 numbers are a group of short telephone numbers that are reserved in the North American Numbering Plan (NANP) for special services, such as emergency calls, telephone directory information, and traffic reports.
The destination-pattern command is used to match both inbound and outbound dial peers. The sequence of dialed digits that will be matched for a dial peer can contain the digits 0 through 9, the asterisk (*), and the pound sign (#). In addition, you can use a period (.) as a wildcard symbol to refine the dialing pattern or to match multiple dial strings for a single dial peer. The command set in this scenario configures a dial peer on a Cisco Unified Communications Manager Express (CME) router to match three-digit patterns ending in 11. By default, CME only forwards digits matched by wildcards in a destination pattern, not digits that are explicitly defined in the destination pattern. Therefore, the destination-pattern .11 command configures CME to forward only the first digit in the destination pattern when a user dials an N11 service code. The no digit-strip, forward digits 3, and forward-digits all commands would modify the digits that are forwarded to the PSTN.
The no digit-strip command configures CME to forward every digit that is matched in a destination pattern, even if the digits are explicitly matched. In this scenario, the no digit strip command would configure CME to forward all three digits of the dialed N11 code, even if the digits are explicitly matched. Therefore, issuing the no-digit strip command would complete the configuration.
Conversely, the digit-strip command enables the default dial peer configuration behavior of stripping digits that are explicitly defined in the destination pattern. Therefore, issuing the digit-strip command would not change the behavior of CME; only the first digit in the destination pattern would be forwarded to the PSTN when a user dials an N11 service code.
The forward-digits command configures a dial peer to forward the rightmost number of digits matched by the destination pattern, even if the digits are explicitly matched. The number of digits forwarded by CME depends on the value configured in the forward-digits command. In this scenario, the forward-digits 3 command would configure CME to forward all three digits of the dialed N11 code, even if the digits are explicitly matched. Therefore, issuing the forward-digits 3 command would complete the configuration.
Issuing the forward-digits all command configures a dial peer to forward every digit that matches the destination pattern, even if the digits are explicitly matched. Conversely, issuing the forward-digits implicit command or the no forward-digits command configures a dial peer to perform the default behavior of stripping digits that are explicitly matched in the destination pattern. In this scenario, the forward-digits all command would configure CME to forward all three digits of the dialed N11 code, even if the digits are explicitly matched. Therefore, issuing the forward-digits all command would complete the configuration.
The forward-digits .11 command contains invalid syntax. Wildcard patterns containing periods can be used with the destination-pattern command to match dialed strings, but they cannot be used with the forward-digits command. Therefore, issuing the forward digits .11 command would not complete the configuration.
The prefix [2-9] command contains invalid syntax. The prefix command is used to add one or more digits to the front of the dial string before the dial string is forwarded to the destination network. You can issue the destination-pattern [2-9] command to match any single digit from 2 through 9, but you cannot issue a digit range with the prefix command. Therefore, issuing the prefix [2-9] command would not complete the configuration.
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