Select four valid fields present in an MPLS label stack entry.
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Correct answer: Label, Experimental (Exp), Bottom of Stack (BoS), Time to Live (TTL).
Why this is the answer
An MPLS label stack entry is a 32-bit field containing four distinct components. The 'Label' field (20 bits) identifies the forwarding equivalence class (FEC). The 'Experimental (Exp)' field (3 bits), also known as Class of Service (CoS) or Traffic Class (TC), is used for QoS prioritization. The 'Bottom of Stack (BoS)' field (1 bit) indicates if the current label is the last in the stack (1 for last, 0 for more labels). The 'Time to Live (TTL)' field (8 bits) prevents loops, similar to IP TTL. 'Sequence Number' and 'Checksum' are not part of the standard MPLS label stack entry.
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