Attacking the foundation

Question 1

Is IPv4/6 a connectionless protocol?

Answer 1

Designed a a layer 3 connectionless protocol. It makes no effort to validate whether the source IP came from the source.

Question 2

IPv4 Header - how many fields?

Answer 2

10

Question 3

How many bytes is the IPv4 Header

Answer 3

Minimum 20 (no data), max is 60 bytes.

Question 4

Version

Answer 4

4 bit field. Identifies the version of IP.

Question 5

What is the length field?

Answer 5

A 4 bit field containing the length of the IP header in 32-bit increments. Min value is 5, and max is 15.

Question 6

What is the differentiated services field?

Answer 6

Formerly, ToS - 8 bit field used to determine priority of each packet.

Question 6

How many bits in a byte

Answer 6

8

Question 7

Total Length

Answer 7

Specifies the length of the IP packet including he IP header and user data. Max size is 65,535 bytes

Question 8

Identification, Flag and Fragment Offset

Answer 8

Fragment and reassemble packets.

Question 9

TTL

Answer 9

8-bit value used to limit the lifetime of a packet.

Question 10

Protocol

Answer 10

8 bit
Identifies next level protocol

Question 11

Header Checksum

Answer 11

Used to determine if any errors have been introduced during transmission

Question 12

Source IP

Answer 12

32 bit binary value

Question 13

Destination IP

Answer 13

32 bit binary value

Question 14

Options and Padding

Question 15

Break

Question 16

IPv6
How many fields

Answer 16

8 fields

Question 17

Version

Answer 17

4 bit - identifies iPv6

Question 18

Traffic Class

Answer 18

8 bit is equivalent to the IPv4 DS field (Differentiated Services)

Question 19

Flow Label

Answer 19

20 bit suggests that all packets with the same flow label receive the same type of handling.

Question 20

Payload Length

Answer 20

16 bit indicates the length of the data portion.

Question 21

Next Header

Answer 21

8 bit field
indicates the data payload type that the packet is carrying. ICMP as an ex.

Question 22

Hop Limit

Answer 22

8 bit, IPv6 TTL (IPv4)

Question 23

Source IPv6

Answer 23

128 bit

Question 24

Destination IPv6

Answer 24

128 bit

Question 25

Break———-

Question 26

IP vulnerabilities - what are they?

Answer 26

ICMP attacks, DoS attacks, DDoS attacks, Address spoofing, MiTM, Session Hijackin

Question 27

TCP Header

Answer 27

More headers

Question 28

Source Port

Answer 28

Yep

Question 29

Destination Port

Question 30

Sequence NUmber

Question 31

Ack Number

Question 32

Header Length

Answer 32

?

Question 33

Reserved

Answer 33

?

Question 34

Control Bits (6)

Answer 34

URG, ACK, PSH, RST, SYN AND FIN

Question 35

Window

Question 36

Checksum

Answer 36

?

Question 37

Urgent

Answer 37

?

Question 38

Options

Answer 38

?

Question 39

Application Layer Data

Question 40

TCP Handshake

Answer 40

???

Question 41

TCP Attacks -

Answer 41

Break