Test your basic knowledge |

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. Which RFC defines IPv4?
Padding of zeros to ensure that the header ends on a 32-bit boundary
0x0800
National Internet Registry
RFC 791

2. What is the ARP Protocol type value for IPv4?
0x0800
Acknowledgement
Router#debug arp
Time to Live

3. What is Reverse ARP?
198.18.0.0/15
RIPv1 and IGRP
Used by a host to obtain the IPv4 address associated with its own MAC address
Application

4. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
88
Time Exceeded
Internet
6

5. Who allocates IP address space and AS numbers to RIRs?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
IANA
17
Router Selection

6. What is the ARP Operation value for an ARP Reply?
2
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
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
255.255.255.224

7. What are the IP Precedence values?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
6
RFC 1918

8. What is the TTL field in the IPv4 header?
Time to Live
Electrical/Optical - Mechanical - Functional and Procedural
Urgent
DHCP

9. What is IP?
Reset
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
17
Internet Protocol

10. What is the format of the ToS field?
Identifier; Flags and Fragmentation Offset
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
255.255.255.240
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

11. Disables proxy ARP on all interfaces
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Router(config)#ip arp proxy disable
Windowing

12. What is covered by the TCP Checksum field?
Router#show arp
Both the TCP header and the encapsulated data
1
Per-Hop Behaviour (PHB)

13. What is gratuitous ARP?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
An ARP request issued by a host with its own IPv4 address as the target address
Used by IRDP on some operating systems to discover local routers
192.0.2.0/24

14. What is the format of the TCP Header Length field?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Length of header in words (32-bit)
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
20 octets

15. What mechanism is used by TCP to regulate the flow of segments?
Redirect
RFC 1918
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Windowing

16. What is the IPv4 Protocol number for ICMP?
ICMP Router Discovery Protocol
Acknowledgements - checksums and timers
URG flag set
1

17. What is the name of the queuing and forwarding of IP packets based on DiffServ?
4
Sequence Numbers
255.255.255.248
Per-Hop Behaviour (PHB)

18. What is the IPv4 Protocol number for IP in IP encapsulation?
Largest segment size that the sender is willing to accept
4
RFC 3330
Router Selection

19. What is the minimum length of an IPv4 header?
Router(config)#ip arp proxy disable
1
20 octets
192.0.2.0/24

20. What is ICMP Type 3?
Uniquely identify every application in the network
Socket
8
Destination Unreachable

21. What is prefix /27 in decimal notation?
255.255.255.224
Network interface
IANA
Per-Hop Behaviour (PHB)

22. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Destination Unreachable
1
ICANN
1

23. Who group public IPv4 address space by major geographic region?
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
Open Systems Interconnection
Reserved (1-bit); DF (1-bit); MF (1-bit)
ICANN and IANA

24. What is Inverse ARP?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

25. What is the prerequisite for using the Urgent Pointer field in the TCP header?
DHCP
Loose source routing; Strict source routing; Record route; Timestamp
Used by a host to obtain the IP address associated with another host's MAC address
URG flag set

26. What is URG?
Urgent
0x0800
255.255.255.224
Synchronize

27. What is ECE?
ECN-Echo
Don't Fragment
Mostly large ISPs - enterprises - or academic institutions
255.255.255.192

28. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
1
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
RIRs

29. What is ICMP Type 5?
Redirect
RFC 1918
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
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);

30. Which protocol has mostly replaced Reverse ARP?
255.255.255.128
Per-Hop Behaviour (PHB)
DHCP
Sequence Numbers

31. What is ICMP?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
4
Router Selection
Internet Control Message Protocol

32. What are the uses of gratuitous ARP?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Electrical/Optical - Mechanical - Functional and Procedural
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Length of header in words (32-bit)

33. What is the Fragment Offset field in the IPv4 header?
Open Systems Interconnection
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Both the TCP header and the encapsulated data
Router(config-if)#no ip proxy-arp

34. What is IRDP?
Sequence Number + Data payload octets + 1
Router(config-if)#arp timeout {seconds}
ICMP Router Discovery Protocol
Internet Corporation for Assigned Network Numbers

35. What is PSH?
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
Router(config-if)#arp timeout {seconds}
20 octets
Push

36. What is CWR?
Redirect
89
Time Exceeded
Congestion Window Reduced

37. What is the IPv4 Protocol number for IGMP?
Regional Internet Registry
2
Urgent
RFC 791

38. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Router#debug arp
IANA
Sequence Number + Data payload octets + 1
Protocols that don't include subnet masks in their routing updates

39. Who administers and registers IP address space and AS numbers within a region?
RIRs
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
255.255.255.224
Used by a host to obtain the IPv4 address associated with its own MAC address

40. What is RST?
4
Reset
Router(config)#arp {ip-address} {mac-address} arpa
Protocols that include subnet masks in their routing updates

41. What mechanism is used by TCP to provided ordered segment delivery?
Acknowledgements - checksums and timers
Sequence Numbers
Sequence Number
RIPv1 and IGRP

42. What is the difference between the ToS and the DiffServ byte?
255.255.255.252
Transmission Control Protocol
Internet Control Message Protocol
They are the same byte - but the names and value interpretations are different

43. What is the format of an IPv4 header?
Router#show arp
Used by a host to obtain the IP address associated with another host's MAC address
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);
Destination Unreachable

44. What is prefix /26 in decimal notation?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
8
2
255.255.255.192

45. What is TCP?
Open Systems Interconnection
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Transmission Control Protocol
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

46. What is ACK?
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
ECN-Echo
An ARP request issued by a host with its own IPv4 address as the target address
Acknowledgement

47. What routing protocols are classful?
Redirect
Padding of zeros to ensure that the header ends on a 32-bit boundary
ICMP Router Discovery Protocol
RIPv1 and IGRP

48. What is the format of a UDP header?
Don't Fragment
Subtract Header Length field from Total Length field
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Internet Corporation for Assigned Network Numbers

49. What is the format of an ARP packet?
Largest segment size that the sender is willing to accept
Used by a host to obtain the IP address associated with another host's MAC address
17
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

50. What are the protocol categories that describe the physical layer?
Router#debug arp
RIRs
Used by a host to obtain the IP address associated with another host's MAC address
Electrical/Optical - Mechanical - Functional and Procedural