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Latency is the time a frame or a packet takes to travel from the source to the destination.
The Provider Edge Bridges
The IP Address identifies a PC on a network. Source: I am an IT student in College :)
IP source and destination address
The data link layer header contains the source's physical address. It refers the address that is found in the Network Interface Card.
An "ip address" is a complete source or destination address that has a network id portion and a client or host portion. The network id is just a piece of the IP address. So, a public ip is an IP address that can be routed, whereas the network id is just a part of the public ip. They aren't different; the network id is part of the ip address.
The source and destination IP address can be identified.
The Layer 3(Network Layer) is associated with IP addressing.Because,It converts the frames into packets and address them to send across the other network through intermediary devices.While transferring across the other network's have to know about the destination IP address and also source IP address's deals with IP address.
Packet
As a packet traverses different networks, the source IP address will always stay the same as the original sending devices IP address unless NAT (Network Address Translation) is involved somewhere along the line.
network portion of ip address
MAC address is a unique number which is necessary for communication between computers in network. It identifies a source and destination device within a Ethernet network.