8 - Internet & TCP/IP Flashcards
1
Q
Requirements of Internetworking (4)
A
- provide a link between networks
- provide routing and delivery of data between process on different networks
- provide an accounting service to keep track
- accommodate the differences between different sub-networks
2
Q
RFCs
A
Requests for Comments
3
Q
TCP/IP Protocol Architecture incl. matching OSI model layer
A
- (7-5) 4 Application
- (4) 3 Transport
- (3) 2 Internet
- (1-2) 1 Network Access
4
Q
Role of Network Access from TCP/IP
A
route date between hosts on the same network
5
Q
Role of Internet from TCP/IP
A
route data across multiple networks and hosts
6
Q
Roles of classes in TCP/IP Addr ?
A
Leading bits
- A - 0
- B - 10
- C - 110
- D - 1110 (multicast)
- E - 11110 (reserved)
7
Q
Addr are encoded via the …
A
… MSB
8
Q
CIDR
A
- Classless Inter Domain Routing
9
Q
CIDR reasons
A
Allows us to subnet IP addr for
- performance
- administration
10
Q
Calculating same subnet
A
- Perform logic AND between addr and subnet mask
11
Q
CIDR uses (3)
A
- routing tables
- configuring firewalls
- security services
12
Q
ARP
A
Addr Resolution Protocol
13
Q
Reason for ARP?
A
Allows a host to discover the mapping for a given IP addr by maintaining a table
14
Q
ARP Packet Outline
A
Dest addr -> src addr -> type -> ARP req or repl -> padding -> CRC
15
Q
ARP Method (3)
A
- Hosts wants to find eth addr of a gateway
- ARP is broadcasted, all hosts receive packet and update tables
- Gateway replies with OpCode 2 and appropriate fields
