I'm a newbie to networking. I wanted to ask this:
When a transmitting device (host A) wishes to send packets to a host (B) which is on a remote network (LAN), (I understand that the datagrams are encapsulated by each layer while going down), I know routers are only concerned with IP addresses from the network layer, but what I don't understand is that the Cisco CCNA book says that when the packet reaches the receiving host's (B) router, the frame's control information is stripped off, and the packet is framed again for sending to host B. If this is true, what is in the control information in a frame? What is changed? Does the source hardware address from Host A change? If so, How? What source address is it replaced by?
I may sound confusing but I don't get the gist of this whole stripping of frames subject.