Loopback Interface: A logical interface that can be use to test if the router is up. Note that a physical interface that is down does not mean that the entire router is down. Used in Cisco for intermediate and advance features.
http://www.networkliquidators.com/article-cisco-ccna-exam-tutorial-loopback-interfaces.asp
FastEthernet: a collective term for a number of Ethernet standards that carry traffic at the nominal rate of 100 Mbit/s, against the original Ethernet speed of 10 Mbit/s.
Source: Wikipedia
Serial Interface: interface that allows sending of data one bit at one time, sequentially.
V.35 Cable - Serial and DTE
DTE DCE
Basic rate interface (BRI, 2B+D, 2B1D): is an Integrated Services Digital Network (ISDN) configuration defined in the physical layer standard I.430 produced by the ITU. This configuration consists of two 64 kbit/s “bearer” channels (B channels) and one 16 kbit/s “Delta” channel (D channel). The B channels are used for voice or user data, and the D channel is used for any combination of: data, control/signalling and X.25 packet networking. The two B channels can be bonded together giving a total data rate of 128 kbit/s
Source: Wikipedia
Auxiliary port: A physical connector on a router that is designed to be used to allow a remote terminal, or PC with a terminal emulator, to access a router using an analog modem.
Console port A component of a router or switch through which commands are entered into a host. (Use a flat console cable)
http://www.proprofs.com/mwiki/index.php/Ultimate_Cisco_CCNA_INTRO_Glossary_&_Acronyms
Gateway of last resort (Default Route): A default route, also known as the gateway of last resort, is the network route used by a router when no other known route exists for a given IP packet’s destination address. All the packets for destinations not known by the router’s routing table are sent to the default route. This route generally leads to another router, which treats the packet the same way: If the route is known, the packet will get forwarded to the known route. If not, the packet is forwarded to the default-route of that router which generally leads to another router. And so on. Each router traversal adds a one-hop distance to the route.
Source: Wikipedia
