Where does the Junos OS place an MPLS header in a data packet?
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A. B. C. D.C
MPLS (Multiprotocol Label Switching) is a mechanism used to forward data packets across a network. The Junos OS, which is the operating system used by Juniper Networks routers and switches, uses MPLS to provide traffic engineering, VPN (Virtual Private Network), and other services.
When a data packet enters a Juniper Networks device, the Junos OS inspects the packet and determines whether it needs to be forwarded using MPLS. If MPLS forwarding is required, the Junos OS places an MPLS header in the packet before it is forwarded.
The location of the MPLS header depends on the type of packet being forwarded. In general, the MPLS header is placed after the Layer 2 header but before the Layer 3 header. This means that the MPLS header is located between the Ethernet (or other Layer 2) header and the IP (or other Layer 3) header.
To be more specific, the MPLS header is added after the Ethernet header, but before the VLAN (if present), and after the VLAN (if present) but before the IP header. This ensures that the MPLS header is carried across the network along with the Layer 2 and Layer 3 headers.
Therefore, the correct answer to the question "Where does the Junos OS place an MPLS header in a data packet?" is option C: before the Layer 3 header.