CN1
Computernetze 1
Computernetze 1
Set of flashcards Details
| Flashcards | 179 |
|---|---|
| Language | Deutsch |
| Category | Computer Science |
| Level | University |
| Created / Updated | 02.01.2020 / 09.01.2020 |
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What is the send window?
The number of bytes that the recepient is allowing the transmitter to have unacknowledged at one time
Welcher Begriff wird beschrieben?
"The number of bytes that the recepient is allowing the transmitter to have unacknowledged at one time."
The send window
What is the usable window?
The amount of the send window that the sender is still allowed to send at any point in time.
Welcher Begriff wird beschrieben?
"The amount of the send window that the sender is still allowed to send at any point in time."
The usable window
Which are the three types of messages that control transitions between states?
- SYN
- FIN
- ACK
What is the purpose of the SYN message?
A synchronize message. Initiales and establishes a connection. It's named after its purpose to synchronize sequence numbers between devices.
What is the purpose of the FIN message?
A finish message, which is a TCP segment with the FIN bit set. It indicates that a device wants to terminate the connection.
What is the purpose of the ACK message?
An acknowledgement message, indicates receipt of a message such a s SYN or a FIN.
What does TCB stand for? (regarding TCP)
Transmission Control Block
What is the Transmission Control Block?
It contains all the important information about the connection such as the two socket numbers that identify it and pointers to buffers that hold incoming and outgoing data.
It also implements the sliding window mechanism.
List the TCP Segment Control Bits
- URG
- ACK
- PSH
- RST
- SYN
- FIN
What is the control bit URG?
The urgent bit. When set to 1, indicates that the priority data transfer feature has been invoked for this segmet and that the urgent pointer field is valid.
What is the segment control bit PSH?
Push bit. The sender of this segment is using the TCP push feature, requesting that the data in this segment be immediately pushed to the application on the receiving device.
What is the segment control bit RST?
Reset bit. The sender has encountered a problem and wants to reset the connection.
What is the MSS (regarding TCP)?
Maximum segment size
Wie heisst der 1 Layer im OSI Modell?
Physical
Wie heisst der 2 Layer im OSI Modell?
Data Link
Wie heisst der 3 Layer im OSI Modell?
Network
Wie heisst der 4 Layer im OSI Modell?
Transport
Wie heisst der 5 Layer im OSI Modell?
Session
Wie heisst der 6 Layer im OSI Modell?
Presentation
Wie heisst der 7 Layer im OSI Modell?
Application
Was sind die beiden wichtigsten Protokolle im Transport Layer?
UDP und TCP
Was heisst OSI ausgeschrieben?
Open Systems Interconnections
Welche Arten von Multiplexierung gibt es?
- Zeitmultiplexierung
- Raummultiplexierung
- Frequenz
- Codemultiplexierung
- Wellenlängenmultiplexierung
Wofür steht CSMA/CD?
Carrier Sense Multiple Access with Collision Detection
Was passiert wenn im Netz eine Collision auftritt?
- Ein 'jam signal' wird ausgesendet welches alle Teilnehmer über die Collision informiert
- Random backoff algorithm
- Geräte senden nicht bis backoff timer ausläuft
- Alle hosts haben gleiche Priorität nachem Timer ausgelaufen
Wie lange ist das Preamble in Bytes?
7
Wie lange ist der Start Frame Delimiter in Bytes?
1
Wie lange ist die Destination MAC Address in Bytes?
6
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