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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 ICMP Type 8?
Internet Protocol
Echo
169.254.0.0/16
Time Exceeded

2. What is prefix /26 in decimal notation?
255.255.255.192
Internet Service Provider
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
255.255.255.224

3. What is the ARP Operation value for an Inverse ARP Request?
Router(config)#arp {ip-address} {mac-address} arpa
All Internet Registries
8
DHCP

4. What is prefix /28 in decimal notation?
255.255.255.248
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
255.255.255.240
Open Systems Interconnection

5. Disables proxy ARP on an interface
4
255.255.255.224
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

6. Deletes dynamic entries from the ARP cache
Address Resolution Protocol
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Echo Reply

7. What is Reverse ARP?
Router#show arp
Internet Control Message Protocol
255.255.255.248
Used by a host to obtain the IPv4 address associated with its own MAC address

8. What is ICMP Type 5?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Regional Internet Registry
Redirect
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

9. What is the the MF-bit in the IPv4 header?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
88
More Fragments follow
169.254.0.0/16

10. What is covered by the TCP Checksum field?
1
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Protocols that include subnet masks in their routing updates
Both the TCP header and the encapsulated data

11. What is CWR?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Congestion Window Reduced
RIRs
1

12. What is prefix /30 in decimal notation?
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
Sequence Number
Acknowledgements - checksums and timers
255.255.255.252

13. What are the most frequently used options in the IPv4 header?
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
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Loose source routing; Strict source routing; Record route; Timestamp
88

14. What is ICANN?
Internet Corporation for Assigned Network Numbers
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);
Open Systems Interconnection
IANA

15. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
RIRs
RIRs
192.88.99.0/24
198.18.0.0/15

16. What is the ARP Operation value for an Inverse ARP Reply?
9
Router(config)#arp {ip-address} {mac-address} arpa
Router(config-if)#no ip proxy-arp
255.255.255.248

17. 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
Synchronize
RFC 1918
Internet Control Message Protocol

18. What is prefix /25 in decimal notation?
255.255.255.128
Loose source routing; Strict source routing; Record route; Timestamp
Regional Internet Registry
RFC 791

19. What routing protocols are classful?
20 octets
Final
RIPv1 and IGRP
47

20. Who assigns IP address space to its own customers?
LIRs
DSCP (6-bit); ECN (2-bit)
Push
0.0.0.0/8

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

22. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Application
Internet Assigned Numbers Authority
IANA
Router(config-if)#no ip proxy-arp

23. What is gratuitous ARP?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Used by a host to obtain the IPv4 address associated with its own MAC address
An ARP request issued by a host with its own IPv4 address as the target address
2

24. What is ISP?
46
Acknowledgements - checksums and timers
Internet Service Provider
Router#show arp

25. Who allocates IP address space and AS numbers to RIRs?
Final
IANA
192.0.2.0/24
6

26. What is IP?
17
Synchronize
Internet Protocol
47

27. Who group public IPv4 address space by major geographic region?
DSCP (6-bit); ECN (2-bit)
Internet
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
ICANN and IANA

28. What is URG?
Time to Live
Urgent
88
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

29. What is the IPv4 Protocol number for OSPF?
Router#debug arp
255.255.255.252
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);
89

30. What is prefix /29 in decimal notation?
255.255.255.248
ICANN and IANA
Host-to-host
Internet Control Message Protocol

31. Enables debugging output for ARP transactions
An ARP request issued by a host with its own IPv4 address as the target address
Sequence Number
Router#debug arp
Used by IRDP on some operating systems to discover local routers

32. What is ICMP Type 11?
192.88.99.0/24
LIRs
Time Exceeded
NIRs

33. What are the steps to subnet an IPv4 address?
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
1
Echo
198.18.0.0/15

34. Disables the sending of ICMP redirect messages
8
ICANN
RIRs
Router(config-if)#no ip redirects

35. What is ICMP?
64
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
192.88.99.0/24
Internet Control Message Protocol

36. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
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
Network interface
Application
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

37. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
1
Internet
Regional Internet Registry
Urgent

38. What is the format of the Flags field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router#show arp
Used by IRDP on some operating systems to discover local routers
ICANN and IANA

39. What are classless routing protocols?
Time Exceeded
255.255.255.248
Echo Reply
Protocols that include subnet masks in their routing updates

40. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
2
Identifier; Flags and Fragmentation Offset
Router(config-if)#arp timeout {seconds}
6

41. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
0x0800
Acknowledgement
Per-Hop Behaviour (PHB)
ICANN

42. What are the protocol categories that describe the physical layer?
Protocols that don't include subnet masks in their routing updates
17
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Electrical/Optical - Mechanical - Functional and Procedural

43. What is the most commonly used Option field in the TCP header?
4
Maximum Segment Size (MSS)
Router(config)#ip arp proxy disable
RFC 3330

44. What is the value of the TCP Reserved field?
0
Router(config-if)#arp timeout {seconds}
4
169.254.0.0/16

45. What is the IPv4 Protocol number for GRE?
47
0
Used by a host to obtain the IP address associated with another host's MAC address
Network interface

46. Who are LIRs?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Mostly large ISPs - enterprises - or academic institutions
47
1

47. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
Internet Control Message Protocol
RFC 1918
3

48. Which RFC defines IPv4?
Local Internet Registry
0x0800
255.255.255.224
RFC 791

49. What is RIR?
Regional Internet Registry
IANA
Internet Assigned Numbers Authority
Redirect

50. Who allocates public IP address ranges to NIRs or LIRs?
Time Exceeded
Open Systems Interconnection
RIRs
47