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Test mit den letzten 14 multiple choice fragen

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Netzwerke 2ter Test 14 Fragen 4 (nur multiple choice)

Pregunta 1 de 14

1

What is the meaning of an acknowledgement number N in the TCP header? Check all that apply:

Selecciona una o más de las siguientes respuestas posibles:

  • The number of correctly received TCP segments

  • All TCP segments up to number N-1 are received correctly

  • All bytes up to number N-1 are received correctly

  • The size of the available receive buffer in bytes

  • The sequence number of the first byte in the next expected segment

Explicación

Pregunta 2 de 14

1

Over which portions is the checksum within the TCP header calculated?

Selecciona una o más de las siguientes respuestas posibles:

  • TCP header + TCP data

  • IP header + TCP header + TCP data

  • Pseudo IP header + TCP header

  • Pseudo IP header + TCP header + TCP data

  • Ethernet header + Pseudo IP header + TCP header + TCP data

  • Ethernet header + Pseudo IP header + TCP header

Explicación

Pregunta 3 de 14

1

Which standard applications use TCP? Check all that applies:

Selecciona una o más de las siguientes respuestas posibles:

  • TFTP

  • FTP

  • LDAP

  • HTTP

  • HTTPS

  • Email (SMTP, POP, IMAP)

  • ARP

Explicación

Pregunta 4 de 14

1

How is the application process addressed? Check all that applies:

Selecciona una o más de las siguientes respuestas posibles:

  • UDP segment number

  • IP identification number

  • Process identification number, ports number and sockets

Explicación

Pregunta 5 de 14

1

List at least 3 internet applications and their corresponding port numbers
HTTP - 80
Telnet - 23
SMTP - 25
SSH - 22
DNS - 53
IMAP - 220

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 6 de 14

1

Which statements on port numbers are correct? Check all that applies:

Selecciona una o más de las siguientes respuestas posibles:

  • TCP/IP port numbers are 32 bit numbers

  • TCP/IP port numbers are 2 byte numbers

  • A HTTP-client uses port number 80

  • A HTTP-client may use port number 8000

  • A HTTP-client may use port number 80 000

  • The default HTTP server port number is 80

Explicación

Pregunta 7 de 14

1

Which statements on well-known and ephemeral ports are correct? Check all that applies:

Selecciona una o más de las siguientes respuestas posibles:

  • 80 is a well-known port number

  • 1000 is an ephemeral port number

  • Well-known ports are uniquely assigned by IANA to certain application layer services at servers

  • Registered port numbers can be used by internet clients

  • Client processes must use well-known ports

Explicación

Pregunta 8 de 14

1

Which statements on sockets are correct? Check all that applies:

Selecciona una o más de las siguientes respuestas posibles:

  • Each side of a TCP connection has a socket which can be identified by the following triple
    < TCP, TCP segment number, IP address >

  • Each side of a TCP connection has a socket which can be identified by the following triple
    < Port number, TCP segment number, IP address >

  • Each side of a TCP connection has a socket which can be identified by the following triple
    < TCP, IP address, port number >

  • A logical TCP connection between a server and client is identified by
    < TCP segment number, local IP address, local port, ACK number, remote IP address >

  • A logical TCP connection between a server and client is identified by
    < TCP, local IP address, local port, remote IP address, remote port >

Explicación

Pregunta 9 de 14

1

Of what functions consists a UDP API?
Creation of new receive ports
Receive operation that returns
Data Bytes
Source Port
Source IP Address
Send operation that returns
A pointer to the data bytes
The destination port
The destination IP address

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 10 de 14

1

List at least 4 TCP socket API function calls:
Open (establishes TCP connection)
Send (sends data from buffer via TCP connection)
Receive (copies incoming TCP data to a user buffer)
Close (closes the TCP connection)
Status (dependable, return information, such as: local socket, foreign socket, window size, TCP connection state, ….)
Abort (causes all pending send and receive operations to be aborted).

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 11 de 14

1

What are the 5 basic processes in a TCP socket implementation?
Open a socket.
Open an input stream and output stream to the socket.
Read from and write to the stream according to the server's protocol.
Close the streams.
Close the socket

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 12 de 14

1

Which are no generic TLDs? Check all that apply:

Selecciona una o más de las siguientes respuestas posibles:

  • .com

  • .technikum-wien.at

  • .at

  • .austria

  • .gov

  • .edu

  • .fhtw

  • .cc

Explicación

Pregunta 13 de 14

1

What is contained within a resource record? Check all that apply:

Selecciona una o más de las siguientes respuestas posibles:

  • Domain name

  • Domain name registry

  • Either UDP or TCP protocol

  • Type

  • Time-to-live

  • Range of IP addresses

  • Rdata (e.g., IPv4 address)

Explicación

Pregunta 14 de 14

1

If a local DNS server starts an iterative query, what is the correct order of inquired name servers? Check the correct answer.

Selecciona una o más de las siguientes respuestas posibles:

  • Authoritative name server – TLD server – root server

  • Authoritative name server only, it performs further enquiries

  • TLD name server

  • TLD server – root server

  • Root server – TLD server – authoritative name server

  • Root server only, it performs further enquiries

Explicación

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