| Exam 642-883 | Question id=3443 | BGP Routing in Service Provider Environments |
Which AS path access list is used by a multihomed customer to only announce their own address space to their service providers to prevent the multihomed customer from becoming a transit AS?
| A. |
ip as-path access-list permit.* | |
| B. |
ip as-path access-list permit^$ | |
| C. |
ip as-path access-list permit _$ | |
| D. |
ip as-path access-list permit _^ | |
| E. |
ip as-path access-list permit local-as ip as-path access-list deny * | |
| F. |
ip as-path access-list deny.* ip as-path access-list permit * |
^ - Start of string
$ - End of string
[] - Range of characters
- - Used to specify range (i.e.[0-9])
() - Logical grouping
. - Any single character
* - Zero or more instances
+ - One or more instance
? - Zero or one instance
_ - Comma, open or close brace, open or close parentheses, start or end of string, or space