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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. Why must the header checksum of an IPv4 packet be recalculated at every router?
RFC 791
RIRs
Each router decrements the TTL
3

2. Who can assign IP address space to end user organizations?
Padding of zeros to ensure that the header ends on a 32-bit boundary
DHCP
Electrical/Optical - Mechanical - Functional and Procedural
All Internet Registries

3. What is the ARP Hardware address length value for Ethernet?
Redirect
NIRs
6
Router#debug arp

4. What is Inverse ARP?

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5. Who allocates public IP address ranges to NIRs or LIRs?
Internet Control Message Protocol
198.18.0.0/15
RIRs
Maximum Segment Size (MSS)

6. What is the ARP Operation value for a Reverse ARP Reply?
Subtract Header Length field from Total Length field
Transmission Control Protocol
Router Advertisement
4

7. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
All Internet Registries
RIPv1 and IGRP
Internet

8. What is ICMP Type 10?
Echo
Sequence Number + Data payload octets + 1
Router Selection
Used by a host to obtain the IP address associated with another host's MAC address

9. What is the DF-bit in the IPv4 header?

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10. What is RIR?
Regional Internet Registry
IANA
Internet Service Provider
ECN-Echo

11. What is the first octet rule for IPv4 address classes in binary?
Destination Unreachable
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Internet Service Provider

12. Which RFC defines IPv4?
Router(config-if)#no ip redirects
National Internet Registry
RFC 791
Internet

13. Who administers and registers IP address space and AS numbers within a region?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Sequence Number + Data payload octets + 1
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
RIRs

14. What is the other name for the TCP Header Length field?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Data Offset
Internet
88

15. Specifies the format in which subnet masks are displayed in show command output
255.255.255.252
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

16. Who allocates IP address space and AS numbers to RIRs?
IANA
64
Padding of zeros to ensure that the header ends on a 32-bit boundary
Sequence Numbers

17. Who group public IPv4 address space by major geographic region?
ICANN and IANA
Loose source routing; Strict source routing; Record route; Timestamp
Used by a host to obtain the IP address associated with another host's MAC address
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

18. What is TCP?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
255.255.255.248
Transmission Control Protocol
Sequence Number

19. What is prefix /29 in decimal notation?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
255.255.255.248
Router#show arp
255.255.255.240

20. What is the purpose of a socket?
Per-Hop Behaviour (PHB)
Uniquely identify every application in the network
An ARP request issued by a host with its own IPv4 address as the target address
Regional Internet Registry

21. Which RFC defines the special use IPv4 address ranges?
Largest segment size that the sender is willing to accept
Padding of zeros to ensure that the header ends on a 32-bit boundary
RFC 3330
4

22. What is RST?
Reset
Internet Service Provider
RFC 791
Router#show arp

23. What are the most frequently used options in the IPv4 header?
Uniquely identify every application in the network
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Loose source routing; Strict source routing; Record route; Timestamp
255.255.255.252

24. What are the private IPv4 address ranges?
Acknowledgements - checksums and timers
Regional Internet Registry
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

25. Who assigns IP address space to its own customers?
LIRs
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);
Router(config-if)#no ip proxy-arp
Windowing

26. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Acknowledgement
Synchronize
DSCP (6-bit); ECN (2-bit)
IANA

27. What mechanisms are used by TCP to provide reliable segment delivery?
Per-Hop Behaviour (PHB)
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
Urgent
Acknowledgements - checksums and timers

28. What is the IPv4 Protocol number for IP in IP encapsulation?
4
Each router decrements the TTL
Application
Router Selection

29. What is the format of the DiffServ byte?
255.255.255.252
Acknowledgements - checksums and timers
DSCP (6-bit); ECN (2-bit)
URG flag set

30. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
RIRs
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Internet Control Message Protocol
ICANN

31. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
Largest segment size that the sender is willing to accept
RIPv1 and IGRP
198.18.0.0/15
4

32. Enables debugging output for ARP transactions
1
The next sequence number that the source expects to receive from the destination
198.18.0.0/15
Router#debug arp

33. What is ACK?
Electrical/Optical - Mechanical - Functional and Procedural
169.254.0.0/16
Acknowledgement
IANA

34. What is ARP?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
198.18.0.0/15
Address Resolution Protocol

35. What is the IPv4 Protocol number for TCP?
17
Congestion Window Reduced
6
Urgent

36. What is the function of ICMP redirect messages?
IPv4 and IPv6
Router(config-if)#no ip proxy-arp
60 octets
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

37. What is the IPv4 Protocol number for OSPF?
255.255.255.252
Windowing
89
Host-to-host

38. 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
Router(config-if)#no ip proxy-arp
4
Acknowledgement

39. What is ICMP Type 5?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Redirect
Protocols that include subnet masks in their routing updates
Echo Reply

40. Disables the sending of ICMP redirect messages
Router(config-if)#no ip redirects
Sequence Number + Data payload octets + 1
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (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

41. What are classless routing protocols?
Protocols that include subnet masks in their routing updates
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
88
198.18.0.0/15

42. What is the ARP Operation value for an Inverse ARP Request?
Router#debug arp
8
Router(config-if)#arp timeout {seconds}
Congestion Window Reduced

43. What is the IPv4 Protocol number of RSVP?
Time to Live
ECN-Echo
Local Internet Registry
46

44. What is IANA?
169.254.0.0/16
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 Assigned Numbers Authority
Mostly large ISPs - enterprises - or academic institutions

45. What is prefix /25 in decimal notation?
Router#debug arp
2
255.255.255.128
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

46. What mechanism is used by TCP to regulate the flow of segments?
Windowing
6
Router#debug arp
17

47. What is the format of the ToS byte in the IPv4 header?
Local Internet Registry
Reserved (1-bit); DF (1-bit); MF (1-bit)
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

48. What is the IPv4 Protocol number for ICMP?
DSCP (6-bit); ECN (2-bit)
1
NIRs
Internet Assigned Numbers Authority

49. Disables proxy ARP on all interfaces
255.255.255.224
Urgent
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(config)#ip arp proxy disable

50. What is IRDP?
6
47
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
ICMP Router Discovery Protocol