Computer Network Network Layer
This layer involves
- IP
- ARP
- ICMP
- IGMP
- RIP
- OSPF
- BGF
- NAT
- CIDR
The layer according to the format:
IP packet format
Features
The core network provides a best-effort IP packet transmission service.
Connectionless, best effort delivery.
It does not provide a commitment to service quality.
Network interconnection.
IP protocol
Outline
IP addresses
IP packet format
ARP
Network segmentation
Subnet Mask
Features
composition
Inter Domain Routing CIDR no choice
Route Aggregation
router
Routers work process
Each of the routes comprising: a destination network address, subnet mask, next hop
Longest prefix match
AS
Autonomous system
Calculation of the dynamic routing table (routing)
RIP
OSPF
BGF
NAT
Network Address Translation
NAT have at least one valid external global IP address
- Reach the default gateway has a NAT function, the network will put all source IP addresses of packets transmitted outwardly to their external IP address, and will generate a "status table" in the. "Connection" --- Source IP (internal), the purpose of IP (outside), identification
(Column outline, will complement update da ~ ~)