Layer Frame

Ffirtl-fi

Uata (ink (ayw

Upper l-iiyoi

Dala link layer

üsader

Ç&0

trailer

Apacket is an info rmation unit whose source and destin ation are network layer entities. A packet is composed of the network layer header (and possibly a trailer) and upper-layer data. The header and era iler cocoain control informatio n inten de ci for the netwo rk iayer entity in the destination system. Data from upper-layer entities is encapsulated in the network layer header and trailer. Figure 1-10 illustrates the basic com ponents of a netwoek layer packet.

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