(A) [1 point] What field in the IP header can be used to to ensure that a packet is forwarded through no more than N routers?

(B) [1 point] If a router has k interfaces, how many IP addresses does it have?

(C) [1 point] Does IPv6 have a fixed or variable length header?

(D) [1 point] Do machines within the same subnet communicate to each other through a router?

(E) [1 point] Must a new machine joining subnet S get its IP address from a DHCP server from inside the same subnet S?