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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 Inverse ARP?

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2. Who administers and registers IP address space and AS numbers within a region?
RIRs
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
Padding of zeros to ensure that the header ends on a 32-bit boundary
NIRs

3. What is prefix /30 in decimal notation?
88
2
0
255.255.255.252

4. What is the format of the Flags field in the TCP header?
255.255.255.128
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 Control Message Protocol
Maximum Segment Size (MSS)

5. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Largest segment size that the sender is willing to accept
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Router(config-if)#no ip proxy-arp
9

6. Who allocates public IP address ranges to NIRs or LIRs?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
89
RIRs
Largest segment size that the sender is willing to accept

7. What is ICMP Type 9?
IANA
Router Advertisement
Sequence Numbers
Subtract Header Length field from Total Length field

8. What is the format of the ToS byte in the IPv4 header?
89
RIRs
Largest segment size that the sender is willing to accept
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

9. What is ARP?
Address Resolution Protocol
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
46

10. What is prefix /26 in decimal notation?
Sequence Number
Each router decrements the TTL
Router#debug arp
255.255.255.192

11. Which RFC defines IPv4?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
1
RFC 791
Reset

12. What is prefix /27 in decimal notation?
Acknowledgement
255.255.255.224
192.88.99.0/24
Used by a host to obtain the IP address associated with another host's MAC address

13. What is URG?
Urgent
Internet Protocol
Internet Corporation for Assigned Network Numbers
An ARP request issued by a host with its own IPv4 address as the target address

14. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
RIRs
ICANN and IANA
Sequence Number + Data payload octets + 1
Used by IRDP on some operating systems to discover local routers

15. What is SYN?
Synchronize
64
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

16. What is gratuitous ARP?
255.255.255.252
The next sequence number that the source expects to receive from the destination
An ARP request issued by a host with its own IPv4 address as the target address
Both the TCP header and the encapsulated data

17. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Length of header in words (32-bit)
More Fragments follow
Application
The next sequence number that the source expects to receive from the destination

18. What is the ARP Operation value for a Reverse ARP Reply?
DSCP (6-bit); ECN (2-bit)
Application
ICMP Router Discovery Protocol
4

19. What is the IPv4 protocol number for UDP?
17
All Internet Registries
255.255.255.192
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

20. What is IANA?
Used by IRDP on some operating systems to discover local routers
Protocols that include subnet masks in their routing updates
Internet Assigned Numbers Authority
They are the same byte - but the names and value interpretations are different

21. What is IRDP?
ICMP Router Discovery Protocol
Uniquely identify every application in the network
Router(config)#arp {ip-address} {mac-address} arpa
National Internet Registry

22. What is prefix /28 in decimal notation?
255.255.255.240
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Synchronize
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

23. What is proxy ARP?
Internet Service Provider
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Time Exceeded
Maximum Segment Size (MSS)

24. What is TCP?
Address Resolution Protocol
RFC 791
NIRs
Transmission Control Protocol

25. What is RIR?
Internet Service Provider
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Regional Internet Registry
1

26. What is the ARP Operation value for an Inverse ARP Reply?
ICANN and IANA
Regional Internet Registry
255.255.255.224
9

27. What is the value of the TCP Reserved field?
0
Router(config-if)#no ip proxy-arp
4
Protocols that include subnet masks in their routing updates

28. What is the ARP Operation value for an ARP Reply?
IANA
Don't Fragment
2
The next sequence number that the source expects to receive from the destination

29. What is a TCP Acknowledgement Number?
Identifier; Flags and Fragmentation Offset
Host-to-host
The next sequence number that the source expects to receive from the destination
Echo

30. What is ICMP Type 5?
Regional Internet Registry
Windowing
RFC 3330
Redirect

31. Deletes dynamic entries from the ARP cache
Router#clear arp-cache [{interface {interface}} | {ip-address}]
ICMP Router Discovery Protocol
Length of header in words (32-bit)
Protocols that include subnet masks in their routing updates

32. What is the function of ICMP router advertisement and router selection messages?
Internet Service Provider
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Used by IRDP on some operating systems to discover local routers
64

33. What is Reverse ARP?
1
Identifier; Flags and Fragmentation Offset
Used by a host to obtain the IPv4 address associated with its own MAC address
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

34. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
Internet Protocol
88
64

35. Who allocates IP address space and AS numbers to RIRs?
4
IANA
ECN-Echo
Redirect

36. What is the difference between the ToS and the DiffServ byte?
Reset
Host-to-host
They are the same byte - but the names and value interpretations are different
Router(config)#arp {ip-address} {mac-address} arpa

37. What is the first octet rule for IPv4 address classes in decimal?
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
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
6
NIRs

38. What is ECE?
Per-Hop Behaviour (PHB)
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
1
ECN-Echo

39. What is the IPv4 Protocol number for EIGRP?
89
ICANN and IANA
88
64

40. What mechanisms are used by TCP to provide reliable segment delivery?
Transmission Control Protocol
Network interface
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Acknowledgements - checksums and timers

41. What are the steps to subnet an IPv4 address?
Acknowledgement
255.255.255.224
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
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

42. What is the minimum length of an IPv4 header?
20 octets
169.254.0.0/16
192.0.2.0/24
ICANN

43. What is the format of the TCP Header Length field?
Socket
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Echo Reply
Length of header in words (32-bit)

44. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Time to Live
17
1
ICANN

45. Which IPv4 address range is reserved for self-identification on a local subnet?
Windowing
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)
0.0.0.0/8

46. What are the uses of gratuitous ARP?
Internet Corporation for Assigned Network Numbers
Internet Service Provider
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
RIRs

47. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Router#debug arp
46
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Used by a host to obtain the IP address associated with another host's MAC address

48. What are the protocol categories that describe the physical layer?
2
4
Protocols that include subnet masks in their routing updates
Electrical/Optical - Mechanical - Functional and Procedural

49. What is FIN?
17
Don't Fragment
Final
Network interface

50. What is the recommended default TTL?
Router#debug arp
Application
64
Local Internet Registry