I am studying the CCNA 200-125 books written by WENDELL ODOM.
Here it talks about the Link layer in TCP/IP model.
Figure 1-11 shows four steps, in the first step Larry encapsulates the IP packet between an Ethernet header and Ethernet trailer, creating an Ethernet frame.
Larry encapsulates the IP packet, what does this mean?
Is it like compressing a file into a zip and compressing the IP packet into a frame?
I've read the previous pages about the upper layer, it seems that every layer has a header.
Does this IP package include all the headers of the upper layer? like TCP, HTTP and IP
As it mentions, the link layer includes a large number of protocols and standards, are all the protocols be encapsulated?
Why Ethernet headers exist at the beginning of the message and Ethernet trailers exist at the end?
Thanks.
Encapsulation means taking data from one protocol and
translating it into another protocol, so the data can continue
across a network. Headers and trailers are added to the
packet.
It does not mean compressing the IP Packet to frame but it means
that some extra information like headers and trailers are added to
the packet so that the message in the packet is safe.
All the headers of the upper layer are present in the IP Package
and when this whole package reaches the destination, it removes the
headers and trailers of each layer one by one and finally delivers
the actuall message to the user.
Ethernet Header is added so that the IP Package knows the
destination and source addresses. Ethernet Trailer is added to
check the redundancy in the message.
I am studying the CCNA 200-125 books written by WENDELL ODOM. Here it talks about the...
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