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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 RIR?
64
Router#debug arp
Regional Internet Registry
IANA

2. What is the format of an ICMP header?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Both the TCP header and the encapsulated data
Open Systems Interconnection
RFC 3330

3. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
ICANN
Push
Subtract Header Length field from Total Length field

4. Which RFC defines the private IPv4 address ranges?
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
RFC 1918
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

5. What is the ARP Operation value for an ARP Reply?
2
255.255.255.128
9
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);

6. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
Loose source routing; Strict source routing; Record route; Timestamp
Identifier; Flags and Fragmentation Offset
Per-Hop Behaviour (PHB)

7. What is prefix /29 in decimal notation?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
255.255.255.248
Router Advertisement
An ARP request issued by a host with its own IPv4 address as the target address

8. What is ICMP Type 5?
Redirect
RIPv1 and IGRP
20 octets
6

9. What is the the MF-bit in the IPv4 header?
4
Push
More Fragments follow
Data Offset

10. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Sequence Number + Data payload octets + 1
Sequence Number
ICANN and IANA
Socket

11. What is Reverse ARP?
Open Systems Interconnection
4
Used by a host to obtain the IPv4 address associated with its own MAC address
Protocols that don't include subnet masks in their routing updates

12. What is ICMP Type 9?
Router Advertisement
Protocols that don't include subnet masks in their routing updates
Destination Unreachable
NIRs

13. What is Inverse ARP?

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14. Who administers and registers IP address space and AS numbers within a region?
89
RIRs
Time Exceeded
Largest segment size that the sender is willing to accept

15. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Router(config)#ip arp proxy disable
Socket
Internet Corporation for Assigned Network Numbers
They are the same byte - but the names and value interpretations are different

16. What is the ARP Hardware address length value for Ethernet?
NIRs
RFC 791
4
6

17. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
Data Offset
Windowing
192.88.99.0/24
8

18. What is the IPv4 Protocol number for EIGRP?
Router Selection
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
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
88

19. What is the IPv4 Protocol number for IGMP?
NIRs
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
2
Electrical/Optical - Mechanical - Functional and Procedural

20. What is IP?
Destination Unreachable
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Internet Protocol
Mostly large ISPs - enterprises - or academic institutions

21. What is the ARP Hardware type value for Ethernet?
1
17
Padding of zeros to ensure that the header ends on a 32-bit boundary
Congestion Window Reduced

22. What is URG?
Windowing
20 octets
Urgent
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

23. What is the format of an IPv4 header?
Acknowledgements - checksums and timers
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);
3

24. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Network interface
Router(config-if)#arp timeout {seconds}
They are the same byte - but the names and value interpretations are different
255.255.255.248

25. What is TCP?
Transmission Control Protocol
198.18.0.0/15
Loose source routing; Strict source routing; Record route; Timestamp
Used by a host to obtain the IPv4 address associated with its own MAC address

26. What mechanisms are used by TCP to provide reliable segment delivery?
Network interface
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Acknowledgements - checksums and timers
Both the TCP header and the encapsulated data

27. What is the minimum length of an IPv4 header?
20 octets
2
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Windowing

28. What is the prerequisite for using the Urgent Pointer field in the TCP header?
URG flag set
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
ICANN and IANA
Urgent

29. What is prefix /26 in decimal notation?
255.255.255.192
All Internet Registries
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
Router#clear arp-cache [{interface {interface}} | {ip-address}]

30. What is LIR?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
192.88.99.0/24
46
Local Internet Registry

31. What routing protocols are classful?
RIPv1 and IGRP
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
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
255.255.255.224

32. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
RFC 1918
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
ICANN and IANA

33. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
ICANN and IANA
ECN-Echo
Push

34. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
4
192.88.99.0/24
Acknowledgement

35. What is PSH?
Reset
Push
Don't Fragment
Congestion Window Reduced

36. What is IRDP?
17
Router(config-if)#no ip proxy-arp
ICMP Router Discovery Protocol
Each router decrements the TTL

37. What is the IPv4 protocol number for UDP?
6
Uniquely identify every application in the network
IANA
17

38. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Identifier; Flags and Fragmentation Offset
Congestion Window Reduced
IANA
2

39. Adds a permanent static ARP entry for an Ethernet host
Open Systems Interconnection
Address Resolution Protocol
Router(config)#arp {ip-address} {mac-address} arpa
Don't Fragment

40. What is prefix /30 in decimal notation?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router Advertisement
Acknowledgements - checksums and timers
255.255.255.252

41. What is the maximum length of an IPv4 header?
More Fragments follow
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
60 octets
RFC 1918

42. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
ECN-Echo
Sequence Number
RIRs
Echo

43. What is CWR?
Congestion Window Reduced
Sequence Number + Data payload octets + 1
Host-to-host
169.254.0.0/16

44. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
IANA
9
All Internet Registries
Application

45. 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
198.18.0.0/15
192.88.99.0/24
255.255.255.252

46. What is the first octet rule for IPv4 address classes in binary?
RIRs
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Router(config)#arp {ip-address} {mac-address} arpa

47. Who assigns IP address space to its own customers?
255.255.255.224
255.255.255.128
Time Exceeded
LIRs

48. Who are LIRs?
Uniquely identify every application in the network
Windowing
Internet Control Message Protocol
Mostly large ISPs - enterprises - or academic institutions

49. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
Router#debug arp
Router(config)#arp {ip-address} {mac-address} arpa
The next sequence number that the source expects to receive from the destination
169.254.0.0/16

50. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Application
Padding of zeros to ensure that the header ends on a 32-bit boundary
RFC 1918