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. What is the most commonly used Option field in the TCP header?
IPv4 and IPv6
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
Sequence Numbers
Maximum Segment Size (MSS)

2. What is SYN?
Synchronize
Reserved (1-bit); DF (1-bit); MF (1-bit)
198.18.0.0/15
Reset

3. What is the content of the the Urgent Pointer field in the TCP header?
RFC 1918
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Urgent

4. What is the IPv4 Protocol number for IP in IP encapsulation?
4
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
255.255.255.252
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

5. Which IPv4 address range is reserved for use in documentation and example code?
Echo
Congestion Window Reduced
Used by a host to obtain the IPv4 address associated with its own MAC address
192.0.2.0/24

6. What is IANA?
46
Internet Assigned Numbers Authority
IANA
255.255.255.192

7. What is ICANN?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
URG flag set
Internet Corporation for Assigned Network Numbers
198.18.0.0/15

8. What is gratuitous ARP?
An ARP request issued by a host with its own IPv4 address as the target address
RIRs
Reserved (1-bit); DF (1-bit); MF (1-bit)
Final

9. What is ICMP?
Internet Control Message Protocol
Internet Corporation for Assigned Network Numbers
4
20 octets

10. What is RIR?
Regional Internet Registry
Padding of zeros to ensure that the header ends on a 32-bit boundary
Data Offset
Application

11. What is the content of the TCP Window Size field?
89
6
169.254.0.0/16
Number of octets - starting with the octet indicated by the Acknowledgement Number - that the receiver will accept from the sender before the sender must stop transmitting and wait for a new Acknowledgement

12. What is the format of a TCP header?
Time Exceeded
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
Internet Control Message Protocol
6

13. What is the IPv4 Protocol number for ICMP?
Identifier; Flags and Fragmentation Offset
RIRs
Internet Service Provider
1

14. What is the ARP Operation value for a Reverse ARP Reply?
89
4
Internet Service Provider
DHCP

15. What is ICMP Type 11?
2
Padding of zeros to ensure that the header ends on a 32-bit boundary
46
Time Exceeded

16. What is the ARP Hardware type value for Ethernet?
ICANN and IANA
1
Loose source routing; Strict source routing; Record route; Timestamp
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

17. What mechanism is used by TCP to regulate the flow of segments?
Windowing
46
Used by IRDP on some operating systems to discover local routers
Sequence Number

18. What is the format of an IPv4 header?
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);
198.18.0.0/15
Reserved (1-bit); DF (1-bit); MF (1-bit)
Sequence Number

19. What is the the MF-bit in the IPv4 header?
Acknowledgements - checksums and timers
Router(config)#ip arp proxy disable
More Fragments follow
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

20. What is proxy ARP?
Don't Fragment
198.18.0.0/15
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Mostly large ISPs - enterprises - or academic institutions

21. What is the name of the queuing and forwarding of IP packets based on DiffServ?
192.0.2.0/24
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
Per-Hop Behaviour (PHB)

22. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Internet Corporation for Assigned Network Numbers
Subtract Header Length field from Total Length field
255.255.255.128
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

23. What is prefix /27 in decimal notation?
255.255.255.224
RFC 1918
RIPv1 and IGRP
Application

24. What is CWR?
17
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Router#debug arp
Congestion Window Reduced

25. Who administers and registers public IP address space and AS numbers within a country or economic unit?
NIRs
0.0.0.0/8
192.0.2.0/24
RFC 791

26. What is IRDP?
ICANN
ICMP Router Discovery Protocol
Internet Service Provider
88

27. What is the IPv4 Protocol number for EIGRP?
ICANN and IANA
60 octets
255.255.255.224
88

28. What is IP?
Internet Protocol
Each router decrements the TTL
RFC 1918
64

29. What is the TTL field in the IPv4 header?
All Internet Registries
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Time to Live
46

30. What is ISP?
Reserved (1-bit); DF (1-bit); MF (1-bit)
9
Internet Service Provider
Both the TCP header and the encapsulated data

31. What is the IPv4 Protocol number for TCP?
Sequence Number + Data payload octets + 1
1
Internet Protocol
6

32. 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
Electrical/Optical - Mechanical - Functional and Procedural
60 octets
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

33. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Padding of zeros to ensure that the header ends on a 32-bit boundary
ECN-Echo
Synchronize

34. What is NIR?
National Internet Registry
Sequence Number + Data payload octets + 1
255.255.255.224
Host-to-host

35. What is the format of the ToS field?
Protocols that don't include subnet masks in their routing updates
Number of octets - starting with the octet indicated by the Acknowledgement Number - that the receiver will accept from the sender before the sender must stop transmitting and wait for a new Acknowledgement
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
46

36. What routing protocols are classful?
Mostly large ISPs - enterprises - or academic institutions
Each router decrements the TTL
IANA
RIPv1 and IGRP

37. What is the ARP Protocol address length value for IPv4?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Protocols that don't include subnet masks in their routing updates
88
4

38. What is the format of the Flags field in the TCP header?
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)
ICMP Router Discovery Protocol
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

39. Who are LIRs?
Address Resolution Protocol
Mostly large ISPs - enterprises - or academic institutions
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
Destination Unreachable

40. What is prefix /29 in decimal notation?
Electrical/Optical - Mechanical - Functional and Procedural
0x0800
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
255.255.255.248

41. What is prefix /30 in decimal notation?
1
DSCP (6-bit); ECN (2-bit)
255.255.255.252
National Internet Registry

42. What IPv4 header fields are used for fragmentation?
3
47
192.88.99.0/24
Identifier; Flags and Fragmentation Offset

43. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
Uniquely identify every application in the network
Transmission Control Protocol
0.0.0.0/8

44. What is URG?
Urgent
Socket
Data Offset
Transmission Control Protocol

45. What is the Fragment Offset field in the IPv4 header?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
2
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Sequence Number + Data payload octets + 1

46. What is Reverse ARP?
RFC 791
Local Internet Registry
RIRs
Used by a host to obtain the IPv4 address associated with its own MAC address

47. What is Inverse ARP?

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

48. What is prefix /28 in decimal notation?
64
89
255.255.255.224
255.255.255.240

49. Which IPv4 address range is reserved for loopback testing?
Sequence Number
Mostly large ISPs - enterprises - or academic institutions
127.0.0.0/8
Synchronize

50. What is the ARP Operation value for an Inverse ARP Reply?
9
Don't Fragment
0.0.0.0/8
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