A datagram of 4,000 bytes (20 bytes of IP header plus 3,980 bytes of IP payload) arrives at a router, and must be forwarded to a link with an MTU (maximum transmission unit) of 1,300 bytes. length ID fragflag offset =4000 |=x =0 =0 One large datagram becomes several smaller datagrams (fragments) length ID fragflag offset = ? =? = ? = ? length ID fragflag fragflag offset = ? = ? = ? = ? Fragment the datagram, and show the values of length, ID, fragflag, and offset of each fragment.