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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. Which IPv4 address range is reserved for self-identification on a local subnet?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
192.0.2.0/24
0.0.0.0/8
Internet Protocol

2. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Router(config)#arp {ip-address} {mac-address} arpa
Network interface
0.0.0.0/8
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

3. What is IP?
Internet Protocol
64
IANA
Host-to-host

4. Who are LIRs?
Router(config)#arp {ip-address} {mac-address} arpa
LIRs
Host-to-host
Mostly large ISPs - enterprises - or academic institutions

5. What is the format of the Flags field in the IPv4 header?
198.18.0.0/15
Loose source routing; Strict source routing; Record route; Timestamp
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)

6. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Sequence Numbers
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
1

7. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
More Fragments follow
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Subtract Header Length field from Total Length field

8. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Socket
RFC 1918
IANA
Router#debug arp

9. What is the IPv4 Protocol number for GRE?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Echo
47
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);

10. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Acknowledgement
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
IANA
ICANN and IANA

11. Disables proxy ARP on an interface
DSCP (6-bit); ECN (2-bit)
Router(config-if)#no ip proxy-arp
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
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

12. 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
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Don't Fragment
Sequence Number + Data payload octets + 1

13. Who administers and registers public IP address space and AS numbers within a country or economic unit?
NIRs
Application
2
Time Exceeded

14. Enables debugging output for ARP transactions
RIRs
Local Internet Registry
Router#debug arp
URG flag set

15. What is ICMP Type 5?
Both the TCP header and the encapsulated data
Reserved (1-bit); DF (1-bit); MF (1-bit)
Redirect
47

16. What are classful routing protocols?

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17. What is the most commonly used Option field in the TCP header?
1
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Maximum Segment Size (MSS)
Padding of zeros to ensure that the header ends on a 32-bit boundary

18. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
2
ICMP Router Discovery Protocol
255.255.255.240

19. What is TCP?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary
More Fragments follow
Transmission Control Protocol

20. What is prefix /29 in decimal notation?
Internet Assigned Numbers Authority
255.255.255.248
RIRs
Acknowledgements - checksums and timers

21. What is the format of the DiffServ byte?
9
Router#debug arp
DSCP (6-bit); ECN (2-bit)
Used by a host to obtain the IP address associated with another host's MAC address

22. What is ICMP Type 11?
Time Exceeded
Largest segment size that the sender is willing to accept
255.255.255.128
Mostly large ISPs - enterprises - or academic institutions

23. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Length of header in words (32-bit)
Host-to-host
198.18.0.0/15
17

24. What is ACK?
255.255.255.240
Acknowledgement
Router(config)#ip arp proxy disable
RFC 1918

25. Who administers and registers IP address space and AS numbers within a region?
4
Destination Unreachable
RIRs
Final

26. What is ICMP Type 8?
Used by IRDP on some operating systems to discover local routers
LIRs
RIRs
Echo

27. What is the content of the TCP Window Size field?
Used by a host to obtain the IP address associated with another host's MAC address
Don't Fragment
Data Offset
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

28. What is the IPv4 Protocol number for TCP?
17
6
Router(config)#arp {ip-address} {mac-address} arpa
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

29. What is the value of the TCP Reserved field?
198.18.0.0/15
Destination Unreachable
0
Time Exceeded

30. Who allocates IP address space and AS numbers to RIRs?
Acknowledgement
4
IANA
198.18.0.0/15

31. What is added after the Option field in the TCP header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Subtract Header Length field from Total Length field
Reserved (1-bit); DF (1-bit); MF (1-bit)
46

32. What mechanism is used by TCP to regulate the flow of segments?
Router(config-if)#no ip redirects
RFC 3330
Both the TCP header and the encapsulated data
Windowing

33. What is the other name for the TCP Header Length field?
Internet Protocol
Data Offset
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
RFC 791

34. Which RFC defines IPv4?
RFC 791
Local Internet Registry
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);
Reserved (1-bit); DF (1-bit); MF (1-bit)

35. Which IPv4 address range is reserved for use in documentation and example code?
255.255.255.192
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
Internet Control Message Protocol
192.0.2.0/24

36. What are the steps to subnet an IPv4 address?
Regional Internet Registry
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
8
2

37. What is the format of the Flags field in the TCP 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)
6
Router#debug arp
Electrical/Optical - Mechanical - Functional and Procedural

38. What mechanisms are used by TCP to provide reliable segment delivery?
The next sequence number that the source expects to receive from the destination
Acknowledgements - checksums and timers
Largest segment size that the sender is willing to accept
4

39. What is the ARP Operation value for an Inverse ARP Reply?
Largest segment size that the sender is willing to accept
9
RIPv1 and IGRP
Electrical/Optical - Mechanical - Functional and Procedural

40. What is RIR?
Mostly large ISPs - enterprises - or academic institutions
20 octets
Regional Internet Registry
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

41. What is the format of a TCP header?
The next sequence number that the source expects to receive from the destination
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
ICMP Router Discovery Protocol
Internet Assigned Numbers Authority

42. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Per-Hop Behaviour (PHB)
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
IANA
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

43. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Sequence Numbers
Router(config)#arp {ip-address} {mac-address} arpa
Per-Hop Behaviour (PHB)
1

44. What is proxy ARP?
RIRs
IANA
1
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

45. What is the format of an ARP packet?
4
Per-Hop Behaviour (PHB)
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

46. What is prefix /25 in decimal notation?
255.255.255.128
0
255.255.255.192
Don't Fragment

47. What is the format of a UDP header?
Used by IRDP on some operating systems to discover local routers
0x0800
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
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

48. What is Inverse ARP?

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49. What is the ARP Hardware address length value for Ethernet?
Router#show arp
6
Time to Live
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

50. What mechanism is used by TCP to provided ordered segment delivery?
Router(config-if)#no ip redirects
Sequence Numbers
Sequence Number + Data payload octets + 1
8