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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)

Frage 1 von 14

1

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

Wähle eine oder mehr der folgenden:

  • 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

Erklärung

Frage 2 von 14

1

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

Wähle eine oder mehr der folgenden:

  • 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

Erklärung

Frage 3 von 14

1

Which standard applications use TCP? Check all that applies:

Wähle eine oder mehr der folgenden:

  • TFTP

  • FTP

  • LDAP

  • HTTP

  • HTTPS

  • Email (SMTP, POP, IMAP)

  • ARP

Erklärung

Frage 4 von 14

1

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

Wähle eine oder mehr der folgenden:

  • UDP segment number

  • IP identification number

  • Process identification number, ports number and sockets

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Frage 5 von 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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 6 von 14

1

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

Wähle eine oder mehr der folgenden:

  • 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

Erklärung

Frage 7 von 14

1

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

Wähle eine oder mehr der folgenden:

  • 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

Erklärung

Frage 8 von 14

1

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

Wähle eine oder mehr der folgenden:

  • 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 >

Erklärung

Frage 9 von 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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 10 von 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).

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 11 von 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

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 12 von 14

1

Which are no generic TLDs? Check all that apply:

Wähle eine oder mehr der folgenden:

  • .com

  • .technikum-wien.at

  • .at

  • .austria

  • .gov

  • .edu

  • .fhtw

  • .cc

Erklärung

Frage 13 von 14

1

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

Wähle eine oder mehr der folgenden:

  • Domain name

  • Domain name registry

  • Either UDP or TCP protocol

  • Type

  • Time-to-live

  • Range of IP addresses

  • Rdata (e.g., IPv4 address)

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Frage 14 von 14

1

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

Wähle eine oder mehr der folgenden:

  • 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

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