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CHAPTER 6: NETWORK LAYER - Coggle Diagram
CHAPTER 6: NETWORK LAYER
The Network Layer
Encapsulation
Routing
Addressing end devices
De-encapsulating
End to End Transport processes
Common Network Layer Protocols
Common Network Layer Protocols
Common Network Layer Protocols
Legacy Network Layer Protocols
AppleTalk
Connectionless Network Service (CLNS/DECNet)
Novell Internetwork Packet Exchange (IPX)
Characteristics of IP
Connectionless- No connection is established before sending data packets
The Sender doesn't know
if the receiver is present
If the letter arrived
If the receiver can read the letter
The receiver doesn't know
When it is coming
Best Effort (unreliable) - No overhead is used to guarantee packet delivery
TCP segments encapsulated into IP packets
Media Independent- operates independently of the medium carrying the data
IP – Best Effort Delivery
As an unreliable Network layer protocol, IP does not guarantee that all sent packets will be received
Other protocols manage the process of tracking packets and ensuring their delivery
Limitations of IPv4
Internet routing table expansion
Lack of end-to-end connectivity
IP Address depletion
Introducing IPv6
Eliminates the need for NAT
Integrated security
Improved packet handling
4 billion IPv4 addresses
4,000,000,000
Increased address space
340 undecillion IPv6 addresses
340,000,000,000,000,000,000,000,000,000,000,000,000
Router Memory
ROM
non volatile
Stores
Basic diagnostic software
Limited IOS
Boot up instructions
NVRAM
Non-volatile
Stores - Startup configuration files
RAM
Volatile
Stores
Running configuration file
IP routing and ARP tables
Running IOS
Packet buffer
Flash
non-volatile
Stores
IOS
Other system files