Its fixed packet size.
The optimum size for a mini laptop screen is 7". This is the smallest size for a mini laptop and they range in sizes from there. You can always visit a store to find out about other sizes.
Frame Size
Totally depends on the hardware and software and their MTU (Maximum Transmission Unit). Usually MTU is set to 1500 bytes.
28 byte
The minimum size of an Ethernet frame is 64 bytes. Even if the VLAN tag is 4 bytes, the Ethernet frame with VLAN tagging remains 64 bytes.
Maybe the ethernet cable is not your problem. Ethernet cables are available everywhere and they all should work for the PS3, PC, router, modem, etc. ethernet ports are one way and are either in or out. The spot on back of the PS3 to connect an ethernet is a standard size and is meant to connect to a modem or a router or it will not work.
The "optimum size" of something is the size that cannot be any higher or larger or bigger or heavier, etc for carryying out a certain task. It depends what sort of stuff and what sort of task we are talking about. "Optimum" means "greatest"
cost and oil production value.
Max it out!!! The CPU can only be as fast as it's cache size and than it's memory.
There is no difference; Ethernet is Ethernet, regardless of where it is deployed.
There is no single answer to this. Large enough to serve its population, but small enough to properly manage, perhaps.