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Laboratory device that works as layer two device is the layer-2 switch that operates on data link layer and physical layer of the OSI model. Bridges are also layer-2 devices but with limited power and ports as compare to layer-2 switches.
Laboratory device that works as layer-3 device is router also known as layer-3 switch that operates on network layer, data link layer and physical layer of the OSI protocol stack.
Different type of Interfaces:
Figure : Different Type of Interfaces 
Interfaces can be categorized into LAN and WAN interfaces:
LAN connectivity is provided through interfaces like Ethernet interface (i.e. E0, E1), Fast Ethernet interface (i.e. FE0, FE1), Fiber Distributed Data Interface (FDDI) (i.e. F0, F1), or Token Ring interface (i.e. T0, T1). 
WAN connectivity is provided through interfaces like synchronous serial interface and asynchronous serial interface (i.e. s0, s1).
And ISDN connectivity is provided through ISDN (Integrated Services Digital Network) interface (i.e. BR0, BR1). 
Two of the redundancy features that carrier level devices have are additional power supplies and back up processors. Corresponding device samples in our laboratory that carry these features are as follows:
QUESTION SET 2:
Three media that support IEEE 802.3 standards are as follows:
Twisted Pair cable (i.e. 10/100 BASE-T)
Coaxial cable (i.e. 10 BASE 2)
Fiber optic cable (i.e. 10 BASE-F)
Yes, you can find all of the above mentioned media that support IEEE 802.3 standards in the DALHOUSIE internetworking laboratory.
Straight Through Ethernet Cable:
The most common type of cable used in the laboratory is straight through Ethernet cable that is used to connect following devices:
Host/Work station to switch or hub
Router to switch or hub
The one of the main reasons for its popularity is that it is simple to create and implement over Ethernet. We only have to make one to one wire connections. Only pins 1, 2, 3, and 6 are used. Just connect 1 to 1, 2 to 2, 3 to 3, and 6 to 6 and you are good to go. It uses RJ-45 connectors to connect devices that's why also known as RJ-45 straight through cable. 
Figure : Pin Assignments and Wiring for an RJ-45 Straight-Through Cable 
Figure : Pin out for Ethernet RJ-45 Straight-Through Cable 
10BaseT cable uses two pairs of shielded/unshielded twisted pair wires to transmit at 10Mbps. It has total of four wires making two pairs one pair known as transmit pair (TD+ and TD-) to send data and other pair known as receive pair (RD+ and RD-) to receive data. 
CAT 5 cable normally uses four pairs of unshielded twisted pair wires to transmit at 10Mbps. 
Difference between Rolled and Crossover cable: Rolled cable provides serial connection between two devices. It is used to connect a PC/computer's COM (Console Serial Communication) Port through DB9 connector to a router's or switch's console port using RJ45 connector to allow terminal communications i.e. console cable, the sky blue color cable in the lab . On the other hand, crossover cable is used to connect PC/Computer to the router's Ethernet port to allow network communications. One other obvious difference between cross over and rolled cable is the pin out connections both cables have different pin out connections. 
Example of crossover cable in the laboratory is the blue cable that uses Smart serial RS232 connection for newer WIG T2 connections or the dark grey cable for older WIG T1 connections that also uses serial connectors in order to make router to router or switch to switch connections in the laboratory. The blue cable that is used to connect hub to a switch using RJ45 connectors is another example of cross over cable.
The Cisco uses the following scheme to mark port numbers on routers:
Type of interface Router number/Slot number /Port number
For example for serial interface it'd be like this Int serial 0/0/0. The first 0 is the router itself, and then the second 0 is the slot number and finally the port number. 
Different Types of Optical Connectors:
LC type connector
Figure : LC type connector 
MTRJ type connector
Figure : MTRJ type connector 
SC type connector
Figure : SC type connector 
FDDI type connector
Figure : FDDI type connector 
Connector types used in gigabit interfaces of Cisco 3550 switches are RJ-45 connectors and SC fiber connectors. 
QUESTION SET 3:
Enable password command doesn't encrypt the password set by user. This password can be viewed by typing command show running-configuration on a router. On the other hand, Enable secret command encrypts the password and when show running-configuration command is entered password appears in encrypted form. Another command used to encrypt password is service password-encryption command. This command will automatically encrypt all the router passwords. 
Line console is used to set password in user mode for console connection. When a user tries to access router through a console port, he'll be asked to enter the console password in user mode in order to access the router.
Vty line is used to set a Telnet password on the router. In order to access router through Telnet user have to provide this password. 
Show controller s command can be used to check types of cables that are connected to the router without visual checking of interfaces. 
Show interface (i.e. s0/0/0), Show ip interface and Show ip interface brief any of these commands can be used to check whether interfaces are up or down. 
Running-configuration is the current running configuration of the router and is stored in the DRAM, whereas startup-configuration is the configuration that will be loaded when router starts up and is stored in the NVRAM of the router. 
The other command to save running or current configuration to router NVRAM is Wr. 
Yes, there are several ways to save router configuration on your computer or somewhere else which are as follows:
You can copy router configuration to a TFTP server by using command copy running-configuration tftp that can be retrieved later by using command copy tftp running-configuration. Other options are as follows: