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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 first octet rule for IPv4 address classes in decimal?
IANA
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
3
Echo Reply

2. Disables proxy ARP on an interface
Router(config-if)#no ip proxy-arp
Don't Fragment
RFC 3330
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

3. What is IP?
198.18.0.0/15
Internet Protocol
ICMP Router Discovery Protocol
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

4. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
192.0.2.0/24
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
IANA
All Internet Registries

5. What is the format of a TCP header?
6
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
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
ICANN

6. What mechanism is used by TCP to provided ordered segment delivery?
Identifier; Flags and Fragmentation Offset
Sequence Numbers
ECN-Echo
Internet

7. What is the ARP Operation value for an ARP Request?
1
LIRs
Reset
Network interface

8. What is IANA?
IANA
Internet Assigned Numbers Authority
Per-Hop Behaviour (PHB)
Time Exceeded

9. What is the format of a UDP header?
Final
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
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
RFC 1918

10. What are the most frequently used options in the IPv4 header?
Identifier; Flags and Fragmentation Offset
Network interface
Loose source routing; Strict source routing; Record route; Timestamp
Padding of zeros to ensure that the header ends on a 32-bit boundary

11. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
20 octets
More Fragments follow
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

12. What is LIR?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
ICMP Router Discovery Protocol
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
Local Internet Registry

13. What is the ARP Hardware type value for Ethernet?
Sequence Number
Router(config)#ip arp proxy disable
1
Router#debug arp

14. What is ISP?
255.255.255.240
Internet Service Provider
9
Router#debug arp

15. Who administers and registers public IP address space and AS numbers within a country or economic unit?
198.18.0.0/15
Echo Reply
Reset
NIRs

16. What is ICMP?
All Internet Registries
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
0

17. What is the IPv4 Protocol number for ICMP?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
1
Sequence Numbers

18. What is the ARP Hardware address length value for Ethernet?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Don't Fragment
6
Local Internet Registry

19. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Time Exceeded
Urgent
6
Subtract Header Length field from Total Length field

20. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
Final
169.254.0.0/16
Router#debug arp
Length of header in words (32-bit)

21. What is the IPv4 Protocol number for TCP?
RFC 791
Address Resolution Protocol
Local Internet Registry
6

22. Which IPv4 address range is reserved for use in documentation and example code?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
192.0.2.0/24
Reset
2

23. What is Inverse ARP?

24. What are the private IPv4 address ranges?
192.88.99.0/24
Transmission Control Protocol
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

25. What is the IPv4 Protocol number for IP in IP encapsulation?
All Internet Registries
4
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
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

26. Which RFC defines the special use IPv4 address ranges?
255.255.255.128
ECN-Echo
RFC 3330
47

27. 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)
IPv4 and IPv6
Internet Corporation for Assigned Network Numbers

28. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Per-Hop Behaviour (PHB)
Router(config)#arp {ip-address} {mac-address} arpa
Sequence Number + Data payload octets + 1
Router#show arp

29. What is IRDP?
Application
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
6
ICMP Router Discovery Protocol

30. What is URG?
Router#show arp
Internet Corporation for Assigned Network Numbers
Urgent
DSCP (6-bit); ECN (2-bit)

31. What is the ARP Operation value for an Inverse ARP Request?
8
Protocols that don't include subnet masks in their routing updates
Uniquely identify every application in the network
Used by IRDP on some operating systems to discover local routers

32. What is the ARP Operation value for a Reverse ARP Reply?
NIRs
Used by IRDP on some operating systems to discover local routers
Router#debug arp
4

33. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
IANA
Padding of zeros to ensure that the header ends on a 32-bit boundary
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Both the TCP header and the encapsulated data

34. What is the content of the the Urgent Pointer field in the TCP header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
255.255.255.192
4
Sequence Numbers

35. Displays the ARP cache of a router
RFC 791
2
Uniquely identify every application in the network
Router#show arp

36. What is ECE?
Network interface
ECN-Echo
Protocols that don't include subnet masks in their routing updates
IANA

37. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
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
255.255.255.224

38. What is ICMP Type 10?
Router Selection
They are the same byte - but the names and value interpretations are different
Router(config)#arp {ip-address} {mac-address} arpa
RFC 791

39. What is the ARP Protocol address length value for IPv4?
198.18.0.0/15
Echo
4
Router#clear arp-cache [{interface {interface}} | {ip-address}]

40. Which protocol has mostly replaced Reverse ARP?
Synchronize
Regional Internet Registry
DHCP
Transmission Control Protocol

41. Who can assign IP address space to end user organizations?
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
All Internet Registries
Padding of zeros to ensure that the header ends on a 32-bit boundary
More Fragments follow

42. Which RFC defines IPv4?
Regional Internet Registry
Protocols that include subnet masks in their routing updates
Loose source routing; Strict source routing; Record route; Timestamp
RFC 791

43. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
RFC 791
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Largest segment size that the sender is willing to accept
Uniquely identify every application in the network

44. What is the other name for the TCP Header Length field?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Data Offset
Urgent
255.255.255.248

45. What is the IPv4 Protocol number for EIGRP?
46
Internet Control Message Protocol
88
DHCP

46. What is ICMP Type 8?
Echo
Both the TCP header and the encapsulated data
RFC 3330
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

47. What is the IPv4 protocol number for UDP?
Windowing
47
88
17

48. 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
IANA
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);
Host-to-host

49. What is prefix /30 in decimal notation?
An ARP request issued by a host with its own IPv4 address as the target address
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Destination Unreachable
255.255.255.252

50. What is ACK?
2
More Fragments follow
RFC 1918
Acknowledgement