Hub switch router Ethernet header 1500 data 14 if you only count the src, dst, and type 18 if you count the CRC 1522 if you have a VLAN tag a 7 octet preamble and one octet start of frame delimiter exists on the wire but doesn’t show up in sniffers there is also another 12 octets of idle characters between frames, which sniffers also ignore IP header TCP header sack Jumbo frames Nagle’s algorithm gratuitous ARP NAT PAT SNAT DNAT
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