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Network+ > TCP > Flashcards

TCP Flashcards

0
Q

TCP page termination handshake

A

FIN, ACK
ACK
FIN, ACK
ACK

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1
Q

Three-way handshake

A

SYN
SYN, ACK
ACK

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2
Q

DCHP Port

A

Client uses UDP port 67 to send

Server uses UDP port 68 to send

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3
Q

NTP? Port?

A

Network time protocol

UDP port 123

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4
Q

SNTP? Port?

A

Simple network time protocol

UDP port 123

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5
Q

TFTP? Port?

A

Trivial file transfer protocol

UDP port 69

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6
Q

ICMP?

A

Internet control message protocol

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7
Q

IGMP? Use?

A

Internet group management protocol
Allows routers to communicate over multicast with group members
Assigned to a 244.0.0.0/4 address

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8
Q

Total range of all port numbers?

A

0-65535

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9
Q

Well-known port number range?

A

0-1023

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10
Q

Range of ephemeral port numbers? Use?

A

1024-5000

Generated randomly by web clients

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11
Q

Range of dynamic/private port numbers?

A

49152-65535

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12
Q

Range of registered port numbers?

A

1024-49151

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13
Q

Socket? Socket pair?

A

Socket: TCP session data (IP address and port) stored on a single computer

Socket pair: same info about both computers involved in the connection

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14
Q

Windows command to see active TCP sessions/connections

A

netstat -n

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15
Q

Open port?

A

A socket that is prepared to respond to any IP packets destined for its port number

16
Q

Windows command to see all open ports

A

netstat -an

17
Q

Netstat switches to show process ID for all TCP connections

A
  • ano
  • a shows all connections
  • n shows raw numbers
  • o shows process IDa
18
Q

Netstat switch to show name of process using TCP connection

A

-b

19
Q

HTTP port

A

TCP 80

20
Q

NNTP port

A

TCP 119

21
Q

HTTPS port

A

TCP 443

22
Q

Telnet port

A

TCP 23

23
Q

What is rLogin? Port?

A

Old UNIX program. Similar to telnet but could configure to log you in automatically.
TCP 513

24
Q

What is RSH? Port?

A

Remote shell. Old UNIX program. Allows you to send single commands to remote server, can be integrated into scripts
TCP 514

25
Q

What is RCP? Port?

A

Remote copy protocol. Old UNIX program. Allowed you to copy files to/from remote server without using FTP or NFS.
TCP 514

26
Q

SSH port

A

TCP 22

27
Q

SMTP port

A

TCP 25

28
Q

POP3 port

A

TCP 110

29
Q

IMAP4 port

A

TCP 143

30
Q

FTP port

A

TCP 20, 21 (passive FTP only uses 21)

31
Q

Passive vs. Active FTP

A

Passive: used behind NAT routers. Client sends FTP request on port 21. Server responds with random port, tells client which port it is listening on. Client sends data back to that port. Client initiates all conversations so NAT router knows where to send packets

Network+ (4 decks)

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