58 lines
2.0 KiB
Markdown
58 lines
2.0 KiB
Markdown
# Reference models
|
|
## 1
|
|
Which layer packs bits into bytes, bytes into frames, uses hardware addressing and implements error detection? Which device (network hardware) operates on this layer in principle?
|
|
- 2nd layer: Data link layer; Switches work on this layer
|
|
|
|
|
|
## 2
|
|
At which layer does the assignment of addresses and the forwarding of data packets from one end of the network to another take place? Which network hardware operates on this layer?
|
|
- Later 3: Network layer; Router
|
|
|
|
|
|
## 3
|
|
Which layer is responsible for establishing, running and terminating a process communication between 2 systems?
|
|
- Layer 5: Session layer
|
|
|
|
|
|
## 4
|
|
At which layer does data stream segmentation take place for communication between endpoints, is a mechanism for establishing/disestablishing virtual connections provided, and does detection and elimination of transport errors as well as flow control or congestion avoidance take place?
|
|
- Layer 4: Transport layer
|
|
|
|
|
|
## 5
|
|
Which layer determines signal levels, transmission speeds, and connector pinouts, and transmits bits in a transmission channel? Which network hardware operates on this layer?
|
|
- Layer 1: Physical layer; Network interface card
|
|
|
|
|
|
## 6
|
|
What boundary does the transport layer form between layers 5-7 and 1-3?
|
|
- The transport layer forms the boundary between the lower transporting layers, which are primarilly concerned with network tasks, and the application oriented layers
|
|
|
|
|
|
## 7
|
|
Contrast the OSI layer model with the widely used TCP/IP layer model. Which layers correspond to each other?
|
|
-
|
|
|
|
|
|
## 8
|
|
What are the addressing names of layers 2, 3, 4 and 7?
|
|
- Layer 2: MAC-adresses
|
|
- Layer 3: IP-adresses
|
|
- Layer 4: Port number
|
|
- Layer 7: Application specific adresses such as E-Mail or URL
|
|
|
|
|
|
## 9
|
|
Can collisions occur in point-to-point networks?
|
|
- No, the switch sends the data out only at the reciver port. With original Ethernet 10 Mbit/s with CSMA/CD collisions can still happen between switch and connected host
|
|
|
|
|
|
## 10
|
|
How are computer networks classified according to their extent?
|
|
- ![[2023-04-18_11-08.png]]
|
|
|
|
|
|
# Tools
|
|
|
|
|