TSB Address space exhaustion(2/3) Routing within large networks became complex Sub-netting introduced advent of pcs meant that each host could no longer have a unique fixed ip address dynamic address assignment(but reachability?) private address spaces(but leakage if connected to public network)5 TSB Address space exhaustion (2/3) • Routing within large networks became complex • Sub-netting introduced • Advent of PCs meant that each host could no longer have a unique fixed IP address – dynamic address assignment (but reachability?) – private address spaces (but leakage if connected to public network)