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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Redirect
Subtract Header Length field from Total Length field
192.0.2.0/24

2. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
NIRs
Router(config)#ip arp proxy disable
Largest segment size that the sender is willing to accept
Subtract Header Length field from Total Length field

3. What is the format of a TCP header?
Open Systems Interconnection
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
RFC 1918
Source Port (16-bit); Destination Port (16-bit); Sequence Number (32-bit); Acknowledgement Number (32-bit); Header Length (4-bit); Reserved (4-bit); Flags (8-bit); Windows Size (16-bit); Checksum (16-bit); Urgent Pointer (16-bit); Options; Padding

4. What is FIN?
Final
0x0800
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
3

5. What is the ARP Operation value for an Inverse ARP Request?
8
4
Push
Network interface

6. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Both the TCP header and the encapsulated data
Acknowledgement
Network interface
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

7. What is the ARP Operation value for a Reverse ARP Request?
2
3
255.255.255.252
Internet Assigned Numbers Authority

8. What are the steps to subnet an IPv4 address?
1 Determine how many subnets are required; 2 Determine how many hosts per subnet are required; 3 Determine the subnet mask for each subnet; 4 Calculate the network address for each subnet
RFC 3330
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
8

9. What is prefix /28 in decimal notation?
255.255.255.240
0x0800
DSCP (6-bit); ECN (2-bit)
4

10. What is the maximum length of an IPv4 header?
60 octets
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router(config-if)#no ip redirects
Sequence Number

11. What is the IPv4 Protocol number for IP in IP encapsulation?
255.255.255.192
60 octets
Version (4-bit); Header Length (4-bit); ToS (8-bit); Total Length (16-bit); Identifier (16-bit); Flags (3-bit); Fragment Offset (13-bit); TTL (8-bit); Protocol (8-bit); Header Checksum (16-bit); Source Address (32-bit); Destination Address (32-bit);
4

12. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Acknowledgement
Uniquely identify every application in the network
4
Sequence Number + Data payload octets + 1

13. What is the TTL field in the IPv4 header?
Mostly large ISPs - enterprises - or academic institutions
Time to Live
0
64

14. What is a TCP port number of an application called when it is coupled with the IP address of the server?
1
3
Socket
255.255.255.240

15. What is IP?
ICANN and IANA
Reset
Internet Protocol
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

16. What is ICMP?
Regional Internet Registry
192.0.2.0/24
Internet Control Message Protocol
Time Exceeded

17. What are the uses of gratuitous ARP?
255.255.255.192
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
1
IANA

18. What is IANA?
Internet Assigned Numbers Authority
4
Padding of zeros to ensure that the header ends on a 32-bit boundary
1

19. What IPv4 header fields are used for fragmentation?
Redirect
Identifier; Flags and Fragmentation Offset
Used by a host to obtain the IPv4 address associated with its own MAC address
17

20. What is the value of the TCP Reserved field?
0x0800
0
IANA
169.254.0.0/16

21. What is the first octet rule for IPv4 address classes in decimal?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
LIRs
47
Echo Reply

22. What is SYN?
Synchronize
Both the TCP header and the encapsulated data
RIRs
RFC 3330

23. Which IPv4 address range is reserved for use in documentation and example code?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Router Selection
169.254.0.0/16
192.0.2.0/24

24. What is the DF-bit in the IPv4 header?

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25. Who allocates public IP address ranges to NIRs or LIRs?
Sequence Number
Both the TCP header and the encapsulated data
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
RIRs

26. What is the ARP Hardware address length value for Ethernet?
Router#debug arp
Open Systems Interconnection
Sequence Number + Data payload octets + 1
6

27. What is a TCP Acknowledgement Number?
The next sequence number that the source expects to receive from the destination
Internet Protocol
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
They are the same byte - but the names and value interpretations are different

28. What routing protocols are classful?
89
46
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
RIPv1 and IGRP

29. What is the most commonly used Option field in the TCP header?
Identifier; Flags and Fragmentation Offset
National Internet Registry
Maximum Segment Size (MSS)
Router(config-if)#no ip proxy-arp

30. What is the difference between the ToS and the DiffServ byte?
127.0.0.0/8
They are the same byte - but the names and value interpretations are different
1
NIRs

31. What mechanism is used by TCP to regulate the flow of segments?
Network interface
Padding of zeros to ensure that the header ends on a 32-bit boundary
Windowing
Largest segment size that the sender is willing to accept

32. What is the the MF-bit in the IPv4 header?
Acknowledgement
1
60 octets
More Fragments follow

33. What is prefix /29 in decimal notation?
255.255.255.248
4
46
Per-Hop Behaviour (PHB)

34. What is the purpose of a socket?
Time Exceeded
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Uniquely identify every application in the network
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

35. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
0.0.0.0/8
IANA
Sequence Numbers
Application

36. What is the ARP Operation value for an ARP Reply?
17
IANA
Per-Hop Behaviour (PHB)
2

37. What is gratuitous ARP?
They are the same byte - but the names and value interpretations are different
An ARP request issued by a host with its own IPv4 address as the target address
ICANN
Internet Assigned Numbers Authority

38. What is the IPv4 Protocol number for GRE?
Acknowledgement
47
DHCP
Redirect

39. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Host-to-host
Address Resolution Protocol
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

40. What is ICMP Type 0?
6
192.0.2.0/24
Electrical/Optical - Mechanical - Functional and Procedural
Echo Reply

41. What is ICMP Type 3?
IANA
Destination Unreachable
Identifier; Flags and Fragmentation Offset
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

42. What are classful routing protocols?

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43. What is the IPv4 Protocol number of RSVP?
192.0.2.0/24
ICMP Router Discovery Protocol
89
46

44. What are the most frequently used options in the IPv4 header?
Network interface
Used by a host to obtain the IPv4 address associated with its own MAC address
Loose source routing; Strict source routing; Record route; Timestamp
Time Exceeded

45. What mechanisms are used by TCP to provide reliable segment delivery?
Router Selection
Destination Unreachable
Acknowledgements - checksums and timers
198.18.0.0/15

46. Specifies the format in which subnet masks are displayed in show command output
Data Offset
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Internet Assigned Numbers Authority

47. What is the format of the DiffServ byte?
DSCP (6-bit); ECN (2-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary
Acknowledgements - checksums and timers
Internet Assigned Numbers Authority

48. What is the format of an ICMP header?
ECN-Echo
Internet Corporation for Assigned Network Numbers
ICANN
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

49. What is the first octet rule for IPv4 address classes in binary?
169.254.0.0/16
URG flag set
Each router decrements the TTL
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

50. What is the IPv4 Protocol number for EIGRP?
Uniquely identify every application in the network
RIRs
88
The next sequence number that the source expects to receive from the destination