M1 & M2

In the OSI reference model, IP belongs to the _______________ layer.

Network

In the TCP/IP reference model, UDP belongs to the _______________ layer.

None of these answers

In the TCP/IP reference model, IP belongs to the _______________ layer.

Internet

Match these popular protocols (services) to their port number/transport protocol.

HTTP (world wide web)

SMTP (early email)

Telnet (unsecure remote login)

SSH (secure remote login)

DNS (Domain Name System)

80 TCP

25 TCP

23 TCP

22 TCP

53 UDP

The original RFC specifying UDP was _________.

RFC 768

A UDP port number has ______________ bits.

16

Check all that apply to TCP or UDP ports.

None of these choices

In the OSI reference model, TCP belongs to the _______________ layer.

Transport

An IPv6 address has ______________ bits.

128

A TCP port number has ______________ bits.

16

These OSI reference model layers do not appear explicitly in the TCP/IP model.

Session

Presentation

Physical

The function call ServerSocket is used by ________________.

a Java TCP Server to establish a TCP server

The function call SocketServer is called by a ________________.

None of these answers

The original RFC specifying TCP was _________.

RFC 793

The highest UDP port number is __________.

65535

A (TCP or UDP) port _______

is a 16 bit number

varies from 0 to 65535

The original RFC specifying IP was

RFC 791

Check all that apply to TCP

TCP stands for Transmission Control Protocol

Is a peer-to-peer communication protocol

provides a reliable in-order byte-stream delivery stream

Adapts to a slow receiver's speed

Adapts to network congestion

Adapts to the slowest intermediary node speed

(May not have all choices listed)

In the OSI reference model, UDP belongs to the _______________ layer.

Transport

An IPv4 address has ______________ bits.

32

In the OSI reference model, socket programming functions like ntohs(), htons(), ntohl(), or htonl() belong logically to the [name1] layer.

presentation

The function call Socket is called by a ________________.

Java TCP Client to initiate a connection with a TCP server

The function call socketclient is used by a ________________.

None of these answers

Check all that apply to IP addresses.

IPv4 has 32 bits addresses

It uniquely identifies a network interface

A host cannot have multiple IP addresses at the same time

All interfaces on a host have the same IP address

IPv6 has 64 bits adresses

IPv4 has 32 bits addresses

It uniquely identifies a network interface

The call ServerSocket in Java performs these actions.

it binds to a port

it may adjust the incoming queue

it creates a socket

Match each socket function call to the sequence it will appear on a Java TCP server. The first/earliest call is assigned the number 1. The earlier is a function call, the smaller is its assigned number. The statements must be compatible (i.e., use appropriate variables from earlier valid statements).

- If a call is NOT absolutely necessary, assign it the number 99.

- If a call is NOT applicable to a TCP server socket, assign it the number 77.

- If two calls can be interchanged, assign them the same number.

b = s.getInputStream();

s = new ServerSocket(..);

a = cs.getOutputStream();

s.close()

cs = s.accept();

a.read(...)

PARTIAL (7.08/8.5)

77

1

3

99

2

4

Match each socket function call to the sequence it will appear on a Java TCP server. The first/earliest call is assigned the number 1. The earlier is a function call, the smaller is its assigned number. The statements must be compatible (i.e., use appropriate variables from earlier valid statements).

- If a call is NOT absolutely necessary, assign it the number 99.

- If a call is NOT applicable to a TCP server socket, assign it the number 77.

- If two calls can be interchanged, assign them the same number.

b = s.getInputStream();

s = new ServerSocket(..);

a = cs.getOutputStream();

s.close()

cs = s.accept();

a.write(...)

PARTIAL (7.08/8.5)

77

1

3

99

2

5

Check all that apply to UDP

-UDP offers a minimal service to the application layer

-uses a checksum to detect corrupted datagrams

Any TCP server socket program in Java must use this function call to establish a socket.

ServerSocket

The call Socket in Java performs these actions

it creates a socket

it may bind to a port

it connects to a server

Any TCP client socket program in Java must use this function call to establish a socket.

Socket

Check all that apply about TCP or UDP port numbers

they are 16 bit numbers

they range from 0 to 65535

TCP and UDP ports are independent from each other

Match each socket function call to the sequence it will appear on a Java TCP client....

Partial 1.21/8.5

b = s.getOutputStream(); 77

s = new ServerSocket(..); 1

a = cs.getInputStream(); 3

s.close() 99

cs = s.accept(); 2

b.write(...) 4

s = new Socket(..); 99

Match each socket function call to the sequence it will appear on a Java TCP client....

b = s.getInputStream(); - 77

s = new ServerSocket(..); - 1

a = cs.getInputStream(); - 3

s.close() - 99

cs = s.accept(); - 2

a.read(...) - 4

The function call DatagramSocket is used by a ________________.

Java UDP Server to establish a UDP socket

Java UDP client to establish a UDP socket

An IP address identifies ___________.

a network interface

The type of the parameter d is _____________ assuming that d is a port number.

int

The function call datagramsocket is used by a ________________. Pay attention! Java is case sensitive.

None of these answers

(There are multiple questions with different choices, but in my experience they are always "None of these Answers". Double check before proceeding.)

Any UDP client socket program in Java must use this function call to establish a socket.

DatagramSocket

The type of the parameter a is _____________ assuming that d is a port number.

byte[ ]

Check all true statements.

TCP identifies upper processes (applications) using the port number

UDP identifies upper processes (applications) using the port number

TCP identifies upper processes (applications) using the IP address

UDP identifies upper processes (applications) using the IP address

Only one port on a host can be active at a time.

TCP identifies upper processes (applications) using the port number

UDP identifies upper processes (applications) using the port number

Match each socket function call to the sequence it will appear on a Java UDP server.

s = new ServerSocket(.....)

s.receive(p)

s = new DatagramSocket(serverPort);

s.send(p)

p = new DatagramPacket(...)

s.close()

Partial 7.08/8.5

77

3

1

4

2

77

Partial 7.08/8.5

77

3

1

4

2

5

Consider the method p.send(s) where p = new DatagramSocket();

DELETE THIS

Consider the method p.receive(s) where p = new DatagramSocket();

The type of the parameter s is _____________ .

DatagramPacket

Check all statements/method calls that TCP server or client must absolutely include to send data using I/O streams a and b. The TCP server or client uses the socket variable sock.

b.write(...)

OutputStream b = sock.getOutputStream();

Any UDP server socket program in Java must use this function call to establish a socket.

DatagramSocket

Consider the method DatagramPacket(a, b, c, d).

The type of the parameter b is _____________ assuming that d is a port number.

int

Consider the method DatagramPacket(a, b, c, d).

The type of the parameter a is _____________ assuming that d is a port number.

byte[]

Consider the method DatagramPacket(a, b, c, d).

The type of the parameter d is _____________ assuming that d is a port number.

int

The function call socketserver is called by a ________________. (Pay attention! Java is case sensitive)

None of these answers

The method DatagramSocket() returns a result of type _________.

DatagramSocket

Match each socket function call to the sequence it will appear on a Java UDP client.

cs = s.accept()

s.receive(p)

s = new DatagramSocket(serverPort);

s.send(p)

p = new DatagramPacket(...)

s.close()

PARTIAL(4.25/8.5):

cs = s.accept()-77

s.receive(p)-4

s = new DatagramSocket(serverPort);-1

s.send(p)-2

p = new DatagramPacket(...)-3

s.close()-5

Consider the method DatagramPacket(a, b, c, d).

The type of the parameter c is _____________ assuming that d is a port number.

inetAddress

The method DatagramPacket(a, b, c, d) returns a result of type _________.

None of these answers

The highest TCP port number is __________.

65535

Check all that apply to TCP.

Partial (5/10)

TCP stands for Transmission Control Protocol

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes();

The content of a[2] is ___________.

52

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes();

The content of a[5] is ___________.

invalid

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16");

The content of a[2] is ___________.

0

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16");

The content of a[5] is ___________.

68

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16BE");

The content of a[7] is ___________.

None of these answers

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16");

The content of a[3] is ___________.

67

Check all that apply.

During the lecture, we encoded the three boolean members single, rich, and female using one byte b using the following rules as illustrated by this figure:

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 0 0 0 female rich single

- bit 0 is the least significant bit. bit 0 is set to 1 if the friend is single.

- bit 1 is set to 1 if the friend is rich.

- bit 2 is set to 1 if the friend is female.

Suppose that after encoding the three boolean members single, rich, and female of a friend f into a byte b, we get b = 0x6. Check all that apply about the friend f.

rich

female

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16BE");

The content of a[3] is ___________.

68

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes();

The content of a[3] is ___________.

None of these answers

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16BE");

The content of a[4] is ___________.

0

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16BE");

The content of a[0] is ___________.

0

During the lecture, we encoded the three boolean members single, rich, and female using one byte b using the following rules as illustrated by this figure:

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 0 0 0 female rich single

- bit 0 is the least significant bit. bit 0 is set to 1 if the friend is single.

- bit 1 is set to 1 if the friend is rich.

- bit 2 is set to 1 if the friend is female.

Suppose that after encoding the three boolean members single, rich, and female of a friend f into a byte b, we get b = 0x5. Check all that apply about the friend f.

female

single

Consider this incomplete code snapshot:

int a, e;

short b, f;

byte g;

DataOutputStream c;

DatagramSocket d;

InputStream w;

ByteArrayOutStream x = new ByteArrayOutputStream();

c = new DataOutputStream(x);

DataInputStream s = new DataInputStream(w);

If I write a statement d.send(m), m is most likely of type __________.

DatagramPacket

Consider this code snapshot:

int a, e;

short b, f;

byte g;

DataOutputStream c;

DataInputStream d;

ByteArrayOutStream x = new ByteArrayOutputStream();

c = new DataOutputStream(x);

Select the most likely valid statement to encode data to be sent out using TCP or UDP sockets.

c.writeInt(a);

Consider this code snapshot:

int a, e;

short b, f;

byte g;

DataOutputStream c;

DataInputStream d;

ByteArrayOutStream x = new ByteArrayOutputStream();

c = new DataOutputStream(x);

Select the most likely valid statement to encode data to be sent out using TCP or UDP sockets.

c.writeShort(b);

Consider this code snapshot:

int a, e;

short b, f;

byte g;

DataOutputStream c;

DataInputStream d;

ByteArrayOutStream x = new ByteArrayOutputStream();

c = new DataOutputStream(x);

Select the most likely valid statement to encode data to be sent out using TCP or UDP sockets.

c.writeByte(g);

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16");

The content of a[0] is ___________.

None of these answers

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16");

The content of a[6] is ___________.

0

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes();

The content of a[0] is ___________.

67

Consider this variable:

byte flags;

The expression ((flags & 4) == 4) is of type ____________.

boolean

Consider this incomplete code snapshot:

int a, e;

long h;

short b, f;

byte g;

DataOutputStream c;

DatagramSocket d;

InputStream m;

ByteArrayOutStream x = new ByteArrayOutputStream();

c = new DataOutputStream(x);

DataInputStream v = new DataInputStream(m);

Select any valid statement.

h = v.readLong();

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16BE");

The content of a[9] is ___________.

54

Select the best answer.

Assume you just received data is stored in network byte order. Below is a snapshot of the data memory storing data. The first column is the address while second one is the data at that address.

The integer (short) variable at address 0x1004 is ___________.

Address Content

0x1000 0x34

0x1001 0xB4

0x1002 0x20

0x1003 0xAE

0x1004 0x42

0x1005 0x67

0x1006 0x19

0x1007 0x3C

0x1008 0x8C

0x4267

Check all that apply.

During the lecture, we encoded the three boolean members single, rich, and female using one byte b using the following rules as illustrated by this figure:

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 0 0 0 female rich single

- bit 0 is the least significant bit. bit 0 is set to 1 if the friend is single.

- bit 1 is set to 1 if the friend is rich.

- bit 2 is set to 1 if the friend is female.

Suppose that after encoding the three boolean members single, rich, and female of a friend f into a byte b, we get b = 0x7. Check all that apply about the friend f.

rich

single

female

Select the best answer.

Assume you just prepared data stored in little endian order. Below is a snapshot of the data memory storing data. The first column is the address while second one is the data at that address.

The integer (short) variable at address 0x1004 is ___________.

Address Content

0x1000 0x34

0x1001 0xB4

0x1002 0x20

0x1003 0xAE

0x1004 0x42

0x1005 0x67

0x1006 0x19

0x1007 0x3C

0x1008 0x8C

0x6742

Select the best answer.

Assume you just prepared data stored in little endian order. Below is a snapshot of the data memory storing data. The first column is the address while second one is the data at that address.

The integer (int) variable at address 0x1002 is ___________.

Address Content

0x1000 0x34

0x1001 0xB4

0x1002 0x20

0x1003 0xAE

0x1004 0x42

0x1005 0x67

0x1006 0x19

0x1007 0x3C

0x1008 0x8C

0x6742AE20

Select the best answer.

Assume you just prepared data stored in little endian order. Below is a snapshot of the data memory storing data. The first column is the address while second one is the data at that address.

The integer (short) variable at address 0x1002 is ___________.

Address Content

0x1000 0x34

0x1001 0xB4

0x1002 0x20

0x1003 0xAE

0x1004 0x42

0x1005 0x67

0x1006 0x19

0x1007 0x3C

0x1008 0x8C

0xAE20

Select the best answer.

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16BE");

The content of a[1] is ___________.

67

Select the best answer.

Consider this incomplete code snapshot:

int a, e;

long h;

short b, f;

byte g;

DataOutputStream c;

DatagramSocket d;

InputStream m;

ByteArrayOutStream x = new ByteArrayOutputStream();

c = new DataOutputStream(x);

DataInputStream v = new DataInputStream(m);

Select any valid statement.

e = v.readInt();

Select the best answer.

Assume you just received data is stored in network byte order. Below is a snapshot of the data memory storing data. The first column is the address while second one is the data at that address.

The integer (int) variable at address 0x1000 is ___________.

Address Content

0x1000 0x34

0x1001 0xB4

0x1002 0x20

0x1003 0xAE

0x1004 0x42

0x1005 0x67

0x1006 0x19

0x1007 0x3C

0x1008 0x8C

0x20AE

None of these answers

0x6742AE20

0x20AE4267

0xAE20

None of these answers

Assume you just received data is stored in network byte order. Below is a snapshot of the data memory storing data. The first column is the address while second one is the data at that address.

The integer (short) variable at address 0x1006 is ___________.

Address Content

0x1000 0x34

0x1001 0xB4

0x1002 0x20

0x1003 0xAE

0x1004 0x42

0x1005 0x67

0x1006 0x19

0x1007 0x3C

0x1008 0x8C

None of these answers (answer is 193C)

Assume you just prepared data stored in little endian order. Below is a snapshot of the data memory storing data. The first column is the address while second one is the data at that address.

The integer (int) variable at address 0x1004 is ___________.

Address Content

0x1000 0x34

0x1001 0xB4

0x1002 0x20

0x1003 0xAE

0x1004 0x42

0x1005 0x67

0x1006 0x19

0x1007 0x3C

0x1008 0x8C

0x3C196742

Assume you just received data is stored in network byte order. Below is a snapshot of the data memory storing data. The first column is the address while second one is the data at that address.

The integer (short) variable at address 0x1002 is ___________.

Address Content

0x1000 0x34

0x1001 0xB4

0x1002 0x20

0x1003 0xAE

0x1004 0x42

0x1005 0x67

0x1006 0x19

0x1007 0x3C

0x1008 0x8C

0x20AE

Consider this code snapshot:

String str = new String("CD456");

byte[] a = str.getBytes("UTF-16");

The content of a[1] is ___________.

None of these answers

During the lecture, we encoded the three boolean members single, rich, and female using one byte b using the following rules as illustrated by this figure:

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 0 0 0 female rich single

- bit 0 is the least significant bit. bit 0 is set to 1 if the friend is single.

- bit 1 is set to 1 if the friend is rich.

- bit 2 is set to 1 if the friend is female.

Suppose that after encoding the three boolean members single, rich, and female of a friend f into a byte b, we get b = 0x3. Check all that apply about the friend f.

single

rich

Consider this incomplete code snapshot:

int a, e;

long h;

short b, f;

byte g;

DataOutputStream c;

DatagramSocket d;

InputStream m;

ByteArrayOutStream x = new ByteArrayOutputStream();

c = new DataOutputStream(x);

DataInputStream v = new DataInputStream(m);

Select any valid statement.

None of these answers

f = v.readInt();

f = v.readLong();

f = c.readInt();

f = c.readLong();

None of these answers

Consider this code snapshot:

int a, e;

short b, f;

byte g;

DataOutputStream c;

DataInputStream d;

ByteArrayOutStream x = new ByteArrayOutputStream();

c = new DataOutputStream(x);

If I write a statement c.write(y,0,8), y is most likely of type __________.

byte[]

Check all statements/method calls that TCP server or client must absolutely include to receive data using I/O streams a and b. The TCP server or client uses the socket variable sock.

b.write(...)

b.read(......)

OutputStream b = sock.getOutputStream();

None of these answers

InputStream a = sock.getInputStream();

InputStream a = sock.getInputStream();

Check all that apply.

During the lecture, we encoded the three boolean members single, rich, and female using one byte b using the following rules as illustrated by this figure:

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 0 0 0 female rich single

- bit 0 is the least significant bit. bit 0 is set to 1 if the friend is single.

- bit 1 is set to 1 if the friend is rich.

- bit 2 is set to 1 if the friend is female.

Suppose that after encoding the three boolean members single, rich, and female of a friend f into a byte b, we get b = 0x0. Check all that apply about the friend f.

None of these answers

The function call Socket is used by a ________________.

None of these answers

The expression (flags & 4) is of type ____________.

NOT boolean

NOT byte

NOT None of these Answers

Matching.

Match each socket function call to the sequence it will appear on a Java TCP server. The first/earliest call is assigned the number 1. The earlier is a function call, the smaller is its assigned number. The statements must be compatible (i.e., use appropriate variables from earlier valid statements).

- If a call is NOT absolutely necessary, assign it the number 99.

- If a call is NOT applicable to a TCP server socket, assign it the number 77.

- If two calls can be interchanged, assign them the same number.

b = s.getInputStream();

s = new ServerSocket(..);

a = cs.getInputStream();

s.close()

cs = s.accept();

a.read(...)

b = s.getInputStream(); - 77

s = new ServerSocket(..); - 1

a = cs.getInputStream(); - 3

s.close() - 99

cs = s.accept(); - 2

a.read(...) - 4

The Internet is a network covering typically _____

A planet

Transmission lines on WANs are in general made of _______.

Radio links

optical fiber

copper wire