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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. What is the ARP Operation value for a Reverse ARP Reply?
4
Echo Reply
255.255.255.248
IPv4 and IPv6

2. What is ARP?
LIRs
Address Resolution Protocol
ECN-Echo
6

3. What is ICMP Type 10?
3
Router Selection
Used by a host to obtain the IPv4 address associated with its own MAC address
Application

4. What is prefix /30 in decimal notation?
255.255.255.240
ICANN and IANA
255.255.255.252
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

5. What is the difference between the ToS and the DiffServ byte?
Local Internet Registry
They are the same byte - but the names and value interpretations are different
89
The next sequence number that the source expects to receive from the destination

6. What is ICMP Type 3?
An ARP request issued by a host with its own IPv4 address as the target address
Router(config-if)#no ip proxy-arp
RIRs
Destination Unreachable

7. What mechanism is used by TCP to regulate the flow of segments?
Each router decrements the TTL
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Windowing
Per-Hop Behaviour (PHB)

8. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
LIRs
47
Redirect

9. What is the ARP Protocol address length value for IPv4?
Push
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
IPv4 and IPv6
4

10. What is the Fragment Offset field in the IPv4 header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
89
Router#show arp
Reset

11. Who assigns IP address space to its own customers?
LIRs
ICANN
4
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

12. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
17
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
ICANN

13. What is prefix /25 in decimal notation?
Router(config-if)#arp timeout {seconds}
255.255.255.128
Reserved (1-bit); DF (1-bit); MF (1-bit)
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

14. What is prefix /29 in decimal notation?
Router Selection
An ARP request issued by a host with its own IPv4 address as the target address
255.255.255.248
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);

15. What is the IPv4 Protocol number for TCP?
6
3
Acknowledgement
Internet Protocol

16. Who administers and registers IP address space and AS numbers within a region?
Congestion Window Reduced
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
RIRs
Identifier; Flags and Fragmentation Offset

17. What is URG?
Internet Assigned Numbers Authority
Internet Protocol
Per-Hop Behaviour (PHB)
Urgent

18. Which protocol has mostly replaced Reverse ARP?
Internet Corporation for Assigned Network Numbers
DHCP
Router(config)#arp {ip-address} {mac-address} arpa
0.0.0.0/8

19. What is ACK?
IPv4 and IPv6
Acknowledgement
RIRs
Synchronize

20. Which RFC defines IPv4?
255.255.255.240
RFC 791
255.255.255.192
255.255.255.224

21. What is the maximum length of an IPv4 header?
198.18.0.0/15
Largest segment size that the sender is willing to accept
Reset
60 octets

22. What is the format of the ToS field?
Router#show arp
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Sequence Number + Data payload octets + 1
They are the same byte - but the names and value interpretations are different

23. What is RST?
Reset
Reserved (1-bit); DF (1-bit); MF (1-bit)
RIRs
Time to Live

24. What is the ARP Operation value for an ARP Request?
1
Host-to-host
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

25. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Congestion Window Reduced
Subtract Header Length field from Total Length field
Synchronize

26. What is the ARP Protocol type value for IPv4?
All Internet Registries
0
DSCP (6-bit); ECN (2-bit)
0x0800

27. What is TCP?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
6
Transmission Control Protocol
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

28. Who are LIRs?
Mostly large ISPs - enterprises - or academic institutions
Internet Assigned Numbers Authority
Internet Service Provider
Router Advertisement

29. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Padding of zeros to ensure that the header ends on a 32-bit boundary
IANA
Socket
60 octets

30. What is the most commonly used Option field in the TCP header?
255.255.255.192
Maximum Segment Size (MSS)
4
ECN-Echo

31. What is the format of the Flags field in the TCP header?
IANA
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#show arp
Open Systems Interconnection

32. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
8
255.255.255.192
ICANN and IANA

33. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
Windowing
Per-Hop Behaviour (PHB)
89

34. What routing protocols are classful?
More Fragments follow
RIPv1 and IGRP
Open Systems Interconnection
4

35. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
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
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
255.255.255.240
4

36. What is the IPv4 Protocol number for IGMP?
88
198.18.0.0/15
6
2

37. What is a TCP Acknowledgement Number?
The next sequence number that the source expects to receive from the destination
Used by a host to obtain the IPv4 address associated with its own MAC address
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
255.255.255.248

38. What is the content of the the Urgent Pointer field in the TCP header?
192.0.2.0/24
Loose source routing; Strict source routing; Record route; Timestamp
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Uniquely identify every application in the network

39. What is the other name for the TCP Header Length field?
Transmission Control 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
Data Offset
6

40. What is prefix /26 in decimal notation?
2
1
ICANN
255.255.255.192

41. What are the protocol categories that describe the physical layer?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Length of header in words (32-bit)
Electrical/Optical - Mechanical - Functional and Procedural
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

42. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
RFC 791
Open Systems Interconnection
Internet
An ARP request issued by a host with its own IPv4 address as the target address

43. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
169.254.0.0/16
255.255.255.192
20 octets
192.0.2.0/24

44. What are the uses of gratuitous ARP?
Router Advertisement
Router#show arp
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
IPv4 and IPv6

45. What is the first octet rule for IPv4 address classes in binary?
Router Selection
Identifier; Flags and Fragmentation Offset
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

46. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
IANA
Windowing
3
0.0.0.0/8

47. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
6
Router#show arp
Largest segment size that the sender is willing to accept
47

48. Who allocates IP address space and AS numbers to RIRs?
IANA
LIRs
The next sequence number that the source expects to receive from the destination
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

49. What is ICMP?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Internet
Internet Service Provider
Internet Control Message Protocol

50. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
255.255.255.192
Sequence Number + Data payload octets + 1
0x0800
Destination Unreachable