Sockets

Question 1

Winsock API requires linking to what file?

Answer 1

ws2_32.lib

Question 2

How is the DLL initialized for Winsock API?

Answer 2

WSAStartup()

Question 3

What 2 parameters are passed to WSAStartup?

Answer 3

1. WORD version
2. WSAData data

Question 4

What are the 3 parameters passed to create a socket?

Answer 4

1. int addressFamily
2. int type
3. int protocol

Question 5

What is the type parameter used when creating a socket for TCP?

Answer 5

SOCK_STREAM

Question 6

What is the type parameter used when creating a socket for UDP?

Answer 6

SOCK_DGRAM

Question 7

What is the address family parameter used when creating a socket?

Answer 7

AF_INET

Question 8

What is the protocol parameter used when creating a socket for TCP?

Answer 8

IPPROTO_TCP

Question 9

What is the protocol parameter used when creating a socket for UDP?

Answer 9

0

Question 10

A server should first ______ a socket and then _____ the socket to its address and endpoint.

Answer 10

create, bind

Question 11

What are the 3 parameters of the bind/connect function?

Answer 11

1. SOCKET socket
2. sockaddr *socketAddress
3. int nameLength

Question 12

What is the nameLength for a socket?

Answer 12

sizeof(socketAddress)

Question 13

How do you pass the socketAddress to the bind/connect function?

Answer 13

(SOCKADDR*)&socketAddress

Question 14

What type is the socketAddress in bind/connect functions?

Answer 14

sockaddr_in

Question 15

What 3 properties of sockaddr_in do we specify?

Answer 15

1. sin_family
2. sin_port
3. sin_addr

Question 16

What is the socketAddress.sin_family?

Answer 16

AF_INET

Question 17

What is the socketAddress.sin_port?

Answer 17

htons(short port)

Question 18

How do you set the socketAddress.sin_addr?

Answer 18

inet_pton(AF_INET, “127.0.0.1”, &(socketAddress.sin_addr))

Question 19

What are the 2 parameters of the listen function?

Answer 19

1. SOCKET socket
2. int numberConnections

Question 20

What are the 3 parameters we used for the accept function?

Answer 20

1. Socket
2. NULL
3. NULL

Question 21

What are the 5 steps to set up a socket on a server?

Answer 21

1. Create socket using socket()
2. Create socketAddress using sockaddr_in and inet_pton
3. Bind the socket to the address using bind()
4. Start listening using listen()
5. Accept connections using accept()

Question 22

How do you close a socket?

Answer 22

closesocket()

Question 23

What’s the final function call in a socket application?

Answer 23

WSACleanup()

Question 24

What function is used to send data with TCP sockets?

Answer 24

send()

Question 25

What function is used to receive data with TCP sockets?

Answer 25

recv()

Question 26

What are the 4 parameters of the send/recv functions?

Answer 26

1. SOCKET socket
2. char* buffer
3. int bufferSize
4. int flags

Question 27

What 2 libraries are included for sockets?

Answer 27

1. WinSock2.h
2. WS2tcpip.h

Question 28

What is passed to htonl() if you want to accept connections from anywhere?

Answer 28

INADDR_ANY

Question 29

What function is used to send messages with UDP?

Answer 29

sendto()

Question 30

What function is used to receive messages with UDP?

Answer 30

recvfrom()

Question 31

What is the difference between the functions for sending/receiving messages between TCP and UDP?

Answer 31

UDP functions have 2 more parameters than TCP

Question 32

Which type of socket requires we specify the client address in the server?

Answer 32

UDP