Day 10 Flashcards - IPv4 Header

Question 1

A router will drop a packet with a TTL of […]

Answer 1

0

Question 2

A value of […] in the IP header ‘Version’ field indicates IP version 4.

Answer 2

4 (binary 0100)

Question 3

A value of […] in the IP header ‘Version’ field indicates IP version 6.

Answer 3

6 (binary 0110)

Question 4

IPv4 header ‘Flags’ field:
Bit […] = DF bit

Answer 4

1

Question 5

IPv4 header ‘Flags’ field:
Bit […] = MF bit

Answer 5

2

Question 6

IPv4 header ‘Flags’ field:
Bit […] = Reserved, always set to 0

Answer 6

0

Question 7

IPv4 header ‘Flags’ field:
What does ‘DF bit’ stand for?

Answer 7

Don’t Fragment bit

Question 8

IPv4 header ‘Flags’ field:
What does ‘MF bit’ stand for?

Answer 8

More Fragments bit

Question 9

IPv4 header ‘Protocol’ field:
Value of 1 = […]

Answer 9

ICMP

Question 10

IPv4 header ‘Protocol’ field:
Value of 17 = […]

Answer 10

UDP

Question 11

IPv4 header ‘Protocol’ field:
Value of 6 = […]

Answer 11

TCP

Question 12

IPv4 header ‘Protocol’ field:
Value of 89 = […]

Answer 12

OSPF

Question 13

IPv4 header ‘Protocol’ field:
Value of […] = ICMP

Answer 13

1

Question 14

IPv4 header ‘Protocol’ field:
Value of […] = OSPF

Answer 14

89

Question 15

IPv4 header ‘Protocol’ field:
Value of […] = TCP

Answer 15

6

Question 16

IPv4 header ‘Protocol’ field:
Value of […] = UDP

Answer 16

17

Question 17

IPv4 header: All fragments of the same packet will have the same value in the […] field.

Answer 17

Identification

Question 18

IPv4 header: the ‘Checksum’ field is […] bits in length.

Answer 18

16

Question 19

IPv4 header: the ‘Destination IP Address’ field is […] bits in length.

Answer 19

32

Question 20

IPv4 header: The ‘DSCP’ field is […] bits in length.

Answer 20

6

Question 21

IPv4 header: The ‘ECN’ field is […] bits in length.

Answer 21

2

Question 22

IPv4 header: The ‘Flags’ field is […] bits in length.

Answer 22

3

Question 23

IPv4 header: The ‘Fragment Offset’ field is […] bits in length.

Answer 23

13

Question 24

IPv4 header: The ‘Identification’ field is […] bits in length.

Answer 24

16

Question 25

IPv4 header: The 'IHL' field is [...] bits in length.

Answer 25

4

Question 26

IPv4 header: The 'Protocol' field is [...] bits in length.

Answer 26

8

Question 27

IPv4 header: the 'Source IP Address' field is [...] bits in length.

Answer 27

32

Question 28

IPv4 header: The 'Total Length' field is [...] bits in length.

Answer 28

16

Question 29

IPv4 header: the 'TTL' field is [...] bits in length.

Answer 29

8

Question 30

IPv4 Header: The IHL field specifies the length of the header in [...] increments.

Answer 30

4-byte (32 bit)

Question 31

IPv4 header: What does 'DSCP' stand for?

Answer 31

Differentiated Services Code Point

Question 32

IPv4 header: What does 'ECN' stand for?

Answer 32

Explicit Congestion Notification

Question 33

IPv4 header: What does 'IHL' stand for?

Answer 33

Internet Header Length

Question 34

IPv4 header: What does 'TTL' stand for?

Answer 34

Time to Live

Question 35

IPv4 header: What is the maximum length of the 'Options' field?

Answer 35

320 bits / 40 bytes

Question 36

IPv4 header: What is the maximum value of the 'Total Length' field?

Answer 36

65,535

Question 37

IPv4 header: What is the maximum value of the IHL field?

Answer 37

15

Question 38

IPv4 header: What is the minimum length of the 'Options' field?

Answer 38

0 bits

Question 39

IPv4 header: What is the minimum value of the 'Total Length' field?

Answer 39

20 (=IPv4 header with no encapsulated data)

Question 40

IPv4 header: What is the minimum value of the IHL field?

Answer 40

5

Question 41

IPv4 header: Which field indicates the protocol of the encapsulated L4PDU?

Answer 41

Protocol

Question 42

IPv4 header: Which field indicates the total length of the packet?

Answer 42

Total Length

Question 43

IPv4 header: Which field is used to check for errors in the header?

Answer 43

Header Checksum

Question 44

IPv4 header: Which field is used to identify which packet a fragment belongs to?

Answer 44

Identification

Question 45

IPv4 header: Which field is used to indicate the position of a fragment within an original, unfragmented IP packet?

Answer 45

Fragment Offset

Question 46

IPv4 header: Which field is used to prevent infinite routing loops?

Answer 46

TTL

Question 47

IPv4 header: Which field is used to prioritize delay-sensitive network traffic?

Answer 47

DSCP

Question 48

IPv4 header: Which field provides end-to-end notification of network congestion?

Answer 48

ECN

Question 49

IPv4 packets are fragmented if they are larger than the [...]

Answer 49

MTU (Maximum Transmission Unit)

Question 50

The IPv4 header 'Version' field is [...] bits in length.

Answer 50

4

Question 51

The MTU is usually [...] bytes.

Answer 51

1500

Question 52

The recommended default TTL of an IPv4 packet is [...]

Answer 52

64

Question 53

Unfragmented IPv4 packets will always have the MF bit set to [...]

Answer 53

0

Question 54

What does 'MTU' stand for?

Answer 54

Maximum Transmission Unit

Question 55

What is the maximum length of the IPv4 header?

Answer 55

60 bytes

Question 56

What is the minimum length of the IPv4 header?

Answer 56

20 bytes