A network administrator receives a call, from a colleague at the overseas branch office, that a BGP route advertised by the company carries an autonomous number of 64520 in the AS_Path attribute. Which statement describes the situation?

A network administrator receives a call, from a colleague at the overseas branch office, that a BGP route advertised by the company carries an autonomous number of 64520 in the AS_Path attribute. Which statement describes the situation?

• The ASN is in the experimental ASN range and should not be used at all.
• The ASN is in the private ASN range and should not be used on the internet.
• The ASN is in the reserved ASN range and is allowed to be used on the internet.
• The ASN is in the private ASN range and NAT should be used to translate this ASN to a public ASN to be used on the internet.

Explanation: BGP ASNs have a private range. The 2-byte AS range is 64,512 to 65,534, and the 4-byte AS range is 4,200,000,000 to 4,294,967,294. These ASNs can be used for networks that are single-homed or dual-homed to the same ISP, thereby preserving the public ASNs for networks that are multihomed to multiple ISPs. Although the private ASNs can be used in a customer network, it is imperative that the ASN not be in the AS_Path attribute when the routes are advertised to the internet.

Exam with this question: Chapter 14: Quiz - Troubleshooting BGP CCNPv8 ENARSI