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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 proxy ARP?
Subtract Header Length field from Total Length field
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
88
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

2. What is prefix /28 in decimal notation?
Electrical/Optical - Mechanical - Functional and Procedural
Internet Control Message Protocol
Largest segment size that the sender is willing to accept
255.255.255.240

3. Which RFC defines the private IPv4 address ranges?
RFC 1918
Congestion Window Reduced
LIRs
Acknowledgement

4. Who allocates public IP address ranges to NIRs or LIRs?
Internet Control Message Protocol
Redirect
RIRs
IPv4 and IPv6

5. What is the format of a UDP header?
ICMP Router Discovery Protocol
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
192.0.2.0/24
Loose source routing; Strict source routing; Record route; Timestamp

6. What routing protocols are classful?
RIPv1 and IGRP
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Router#debug arp
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

7. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
Regional Internet Registry
Acknowledgements - checksums and timers
RIRs

8. Who administers and registers IP address space and AS numbers within a region?
ECN-Echo
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
RIRs
8

9. Deletes dynamic entries from the ARP cache
Open Systems Interconnection
Local Internet Registry
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

10. What is prefix /25 in decimal notation?
47
Per-Hop Behaviour (PHB)
255.255.255.128
192.88.99.0/24

11. Who group public IPv4 address space by major geographic region?
ICANN and IANA
National Internet Registry
Mostly large ISPs - enterprises - or academic institutions
Largest segment size that the sender is willing to accept

12. What is the function of ICMP router advertisement and router selection messages?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Time Exceeded
Subtract Header Length field from Total Length field
Used by IRDP on some operating systems to discover local routers

13. What is the ARP Operation value for a Reverse ARP Reply?
4
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
Protocols that include subnet masks in their routing updates
Length of header in words (32-bit)

14. Which RFC defines the special use IPv4 address ranges?
Padding of zeros to ensure that the header ends on a 32-bit boundary
9
NIRs
RFC 3330

15. What is IP?
Regional Internet Registry
Protocols that don't include subnet masks in their routing updates
Internet Protocol
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

16. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
An ARP request issued by a host with its own IPv4 address as the target address
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

17. Who allocates IP address space and AS numbers to RIRs?
IANA
Protocols that don't include subnet masks in their routing updates
Internet Service Provider
Both the TCP header and the encapsulated data

18. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
Acknowledgement
Sequence Number
Internet Corporation for Assigned Network Numbers

19. Who administers and registers public IP address space and AS numbers within a country or economic unit?
They are the same byte - but the names and value interpretations are different
All Internet Registries
NIRs
255.255.255.128

20. What is prefix /30 in decimal notation?
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
17
255.255.255.252

21. What mechanisms are used by TCP to provide reliable segment delivery?
Acknowledgements - checksums and timers
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
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
Internet

22. What is ICMP?
Don't Fragment
60 octets
Internet Control Message Protocol
Time Exceeded

23. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
They are the same byte - but the names and value interpretations are different
All Internet Registries
198.18.0.0/15
Used by a host to obtain the IP address associated with another host's MAC address

24. What is the first octet rule for IPv4 address classes in binary?
Data Offset
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
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
46

25. What is the ARP Protocol type value for IPv4?
Reset
Padding of zeros to ensure that the header ends on a 32-bit boundary
Final
0x0800

26. What is the format of a TCP header?
47
0x0800
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
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

27. What is the difference between the ToS and the DiffServ byte?
RIRs
Router Advertisement
They are the same byte - but the names and value interpretations are different
Internet Corporation for Assigned Network Numbers

28. What is ICMP Type 5?
Internet Protocol
RFC 3330
88
Redirect

29. What is the IPv4 Protocol number for EIGRP?
Protocols that include subnet masks in their routing updates
88
Largest segment size that the sender is willing to accept
Mostly large ISPs - enterprises - or academic institutions

30. Who are LIRs?
Electrical/Optical - Mechanical - Functional and Procedural
Internet Control Message Protocol
Mostly large ISPs - enterprises - or academic institutions
Protocols that include subnet masks in their routing updates

31. What is Reverse ARP?
Used by a host to obtain the IPv4 address associated with its own MAC address
Time Exceeded
ICANN and IANA
Urgent

32. What is gratuitous ARP?
198.18.0.0/15
An ARP request issued by a host with its own IPv4 address as the target address
They are the same byte - but the names and value interpretations are different
Application

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

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34. What is ICMP Type 9?
4
64
255.255.255.128
Router Advertisement

35. What is OSI?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Router(config-if)#no ip redirects
Open Systems Interconnection
Used by a host to obtain the IP address associated with another host's MAC address

36. What is IRDP?
Open Systems Interconnection
ICMP Router Discovery Protocol
Mostly large ISPs - enterprises - or academic institutions
Internet

37. What is ECE?
255.255.255.248
Router#clear arp-cache [{interface {interface}} | {ip-address}]
ECN-Echo
3

38. What are the IP Precedence values?
RIRs
Windowing
ICANN and IANA
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

39. What is the other name for the TCP Header Length field?
Data Offset
Router#clear arp-cache [{interface {interface}} | {ip-address}]
URG flag set
Per-Hop Behaviour (PHB)

40. What is the format of the ToS byte in the IPv4 header?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
1
0.0.0.0/8

41. What is the IPv4 Protocol number for IGMP?
46
2
RFC 791
RFC 3330

42. What is CWR?
Destination Unreachable
Router(config-if)#no ip redirects
Congestion Window Reduced
192.0.2.0/24

43. What is the ARP Operation value for a Reverse ARP Request?
Host-to-host
Internet Service Provider
1
3

44. What are classful routing protocols?

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45. What is prefix /27 in decimal notation?
3
255.255.255.224
0x0800
Router#clear arp-cache [{interface {interface}} | {ip-address}]

46. Why must the header checksum of an IPv4 packet be recalculated at every router?
Internet Corporation for Assigned Network Numbers
Router(config)#arp {ip-address} {mac-address} arpa
Each router decrements the TTL
Router Advertisement

47. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
Congestion Window Reduced
169.254.0.0/16
3
IANA

48. What is the IPv4 Protocol number for IP in IP encapsulation?
Mostly large ISPs - enterprises - or academic institutions
4
Both the TCP header and the encapsulated data
Windowing

49. What is the recommended default TTL?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
198.18.0.0/15
64
4

50. What is URG?
Urgent
Padding of zeros to ensure that the header ends on a 32-bit boundary
Open Systems Interconnection
IANA