| Exam 400-101 | Question id=883 | Layer 3 Technologies |
Which of the following is true regarding the structure of a multiprotocol BGP VPN-IPv4 address?
| A. |
It begins with a 2byte Type field and ends with a 6byte Value field. | |
| B. |
It begins with an 8byte RD and ends with a 4byte IPv4 address. | |
| C. |
It begins with a 4byte VPN ID and ends with an 8byte RD. | |
| D. |
It begins with a 4byte ASN and ends with a 2byte Assigned Number. | |
| E. |
It begins with a 6byte MAC address and ends with a 4byte IPv4 address. |
A multiprotocol Border Gateway Protocol (BGP) virtual private network (VPN)IPv4 address begins with an 8byte route distinguisher (RD) and ends with a 4byte IPv4 address. The RD consists of a 2byte Type field and a 6byte Value field. The value of the Type field determines what the structure of the Value field is.
If the Type field is 0, the Administrator subfield is a 2byte autonomous system number (ASN).
If the Type field is 1, the Administrator subfield is an IP address. If the
Type field is 2, the Administrator subfield is a 4byte ASN.
In all cases, the Assigned Number subfield contains a number assigned by the administrator.
The BGP VPN-IPv4 address does not contain a VPN ID or a Media Access Control (MAC) address.