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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
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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. Which RFC defines the private IPv4 address ranges?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Largest segment size that the sender is willing to accept
RFC 1918
Reset

2. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Per-Hop Behaviour (PHB)
64
They are the same byte - but the names and value interpretations are different
The next sequence number that the source expects to receive from the destination

3. What is ICMP Type 9?
National Internet Registry
Electrical/Optical - Mechanical - Functional and Procedural
Router Advertisement
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

4. What is the ARP Operation value for a Reverse ARP Request?
3
Sequence Numbers
Transmission Control Protocol
Loose source routing; Strict source routing; Record route; Timestamp

5. What is the IPv4 Protocol number for TCP?
0x0800
2
4
6

6. What is the format of an ARP packet?
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address
URG flag set
NIRs
Acknowledgement

7. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
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
47
IANA
Used by a host to obtain the IPv4 address associated with its own MAC address

8. Which IPv4 address range is reserved for use in documentation and example code?
IANA
192.0.2.0/24
60 octets
IANA

9. What is the the MF-bit in the IPv4 header?
Uniquely identify every application in the network
More Fragments follow
3
Padding of zeros to ensure that the header ends on a 32-bit boundary

10. What is IP?
Internet Protocol
0x0800
255.255.255.128
Router(config)#ip arp proxy disable

11. Specifies the format in which subnet masks are displayed in show command output
1
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);
RFC 1918
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

12. What is the format of the Flags field in the TCP header?
Used by a host to obtain the IP address associated with another host's MAC address
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Network interface
Congestion Window Reduced

13. Who allocates IP address space and AS numbers to RIRs?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Destination Unreachable
1
IANA

14. What is prefix /28 in decimal notation?
3
255.255.255.240
Address Resolution Protocol
Transmission Control Protocol

15. What is RST?
Mostly large ISPs - enterprises - or academic institutions
Reset
20 octets
RFC 3330

16. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Acknowledgement
Router(config-if)#no ip proxy-arp
Internet Control Message Protocol
Socket

17. Displays the ARP cache of a router
6
Router(config-if)#no ip proxy-arp
Router#show arp
Used by a host to obtain the IPv4 address associated with its own MAC address

18. Who are LIRs?
Synchronize
Congestion Window Reduced
Mostly large ISPs - enterprises - or academic institutions
Protocols that include subnet masks in their routing updates

19. What is the first octet rule for IPv4 address classes in binary?
IANA
192.0.2.0/24
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
6

20. What are the most common IP version numbers?
IPv4 and IPv6
127.0.0.0/8
Network interface
ICMP Router Discovery Protocol

21. What is the ARP Operation value for an ARP Request?
RIPv1 and IGRP
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Address Resolution Protocol
1

22. What are classless routing protocols?
Largest segment size that the sender is willing to accept
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Protocols that include subnet masks in their routing updates
More Fragments follow

23. What is the format of a UDP header?
4
47
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
6

24. What is added after the option field in the IPv4 header?
3
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router Advertisement
Internet Protocol

25. What is the format of a TCP header?
4
3
Time to Live
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

26. What is prefix /29 in decimal notation?
255.255.255.248
IANA
127.0.0.0/8
RFC 1918

27. What is ICMP Type 10?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Router Selection
255.255.255.240
60 octets

28. What is Inverse ARP?

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29. What are the private IPv4 address ranges?
Congestion Window Reduced
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Used by a host to obtain the IPv4 address associated with its own MAC address
Used by IRDP on some operating systems to discover local routers

30. What is the ARP Operation value for an Inverse ARP Reply?
Destination Unreachable
RFC 1918
RIRs
9

31. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
ECN-Echo
ICANN
Internet Assigned Numbers Authority
0x0800

32. What is ECE?
Synchronize
Don't Fragment
ECN-Echo
4

33. What routing protocols are classful?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
URG flag set
RIPv1 and IGRP
Router#show arp

34. What is the first octet rule for IPv4 address classes in decimal?
Regional Internet Registry
Subtract Header Length field from Total Length field
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Padding of zeros to ensure that the header ends on a 32-bit boundary

35. What is the IPv4 Protocol number for GRE?
2
47
Sequence Number
Each router decrements the TTL

36. What is covered by the TCP Checksum field?
255.255.255.128
Sequence Numbers
Windowing
Both the TCP header and the encapsulated data

37. What is prefix /26 in decimal notation?
255.255.255.192
IPv4 and IPv6
Address Resolution Protocol
Socket

38. What is the purpose of a socket?
Acknowledgements - checksums and timers
Uniquely identify every application in the network
Padding of zeros to ensure that the header ends on a 32-bit boundary
ICANN

39. What is FIN?
All Internet Registries
Electrical/Optical - Mechanical - Functional and Procedural
Final
Internet Service Provider

40. Which IPv4 address range is reserved for loopback testing?
Router Advertisement
Padding of zeros to ensure that the header ends on a 32-bit boundary
46
127.0.0.0/8

41. What is gratuitous ARP?
ICANN and IANA
An ARP request issued by a host with its own IPv4 address as the target address
8
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

42. What IPv4 header fields are used for fragmentation?
Identifier; Flags and Fragmentation Offset
255.255.255.240
Subtract Header Length field from Total Length field
Open Systems Interconnection

43. What is IANA?
Internet Assigned Numbers Authority
Acknowledgements - checksums and timers
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Used by a host to obtain the IP address associated with another host's MAC address

44. What are the protocol categories that describe the physical layer?
Electrical/Optical - Mechanical - Functional and Procedural
192.0.2.0/24
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

45. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
6
Redirect
RIPv1 and IGRP

46. What is the format of an ICMP header?
Congestion Window Reduced
Echo
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
RIPv1 and IGRP

47. What is ICMP Type 8?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
192.88.99.0/24
255.255.255.128
Echo

48. Who group public IPv4 address space by major geographic region?
ICANN and IANA
Maximum Segment Size (MSS)
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Each router decrements the TTL

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

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50. What is the IPv4 protocol number for UDP?
Data Offset
Per-Hop Behaviour (PHB)
17
URG flag set