Adaptors Communicating datagram sending link layer protocol rcving node node frame frame adapter adapter link layer implemented in ▣receiving side "adaptor"(aka NIC) o looks for errors,rdt,flow o Ethernet card,PCMCI control,etc card,802.11 card o extracts datagram,passes ▣sending side: to rcving node o encapsulates datagram in ▣adapter is semi- a frame autonomous o adds error checking bits,link physical layers rdt,flow control,etc. 5:DataLink Layer 5-8 5: DataLink Layer 5-8 Adaptors Communicating  link layer implemented in “adaptor” (aka NIC)  Ethernet card, PCMCI card, 802.11 card  sending side:  encapsulates datagram in a frame  adds error checking bits, rdt, flow control, etc.  receiving side  looks for errors, rdt, flow control, etc  extracts datagram, passes to rcving node  adapter is semi￾autonomous  link & physical layers sending node frame rcving node datagram frame adapter adapter link layer protocol