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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 the format of an ICMP header?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Per-Hop Behaviour (PHB)
Internet Assigned Numbers Authority

2. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Urgent
Padding of zeros to ensure that the header ends on a 32-bit boundary
RIRs
Host-to-host

3. Who can assign IP address space to end user organizations?
9
All Internet Registries
Used by a host to obtain the IP address associated with another host's MAC address
Router#debug arp

4. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Subtract Header Length field from Total Length field
Uniquely identify every application in the network
Used by a host to obtain the IP address associated with another host's MAC address

5. What is the ARP Hardware type value for Ethernet?
URG flag set
Data Offset
National Internet Registry
1

6. What is IP?
Internet Protocol
255.255.255.224
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
255.255.255.252

7. Which IPv4 address range is reserved for self-identification on a local subnet?
They are the same byte - but the names and value interpretations are different
Data Offset
Router#show arp
0.0.0.0/8

8. What is added after the Option field in the TCP header?
Uniquely identify every application in the network
Subtract Header Length field from Total Length field
Padding of zeros to ensure that the header ends on a 32-bit boundary
Protocols that include subnet masks in their routing updates

9. What is the IPv4 Protocol number for EIGRP?
88
Loose source routing; Strict source routing; Record route; Timestamp
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
RIRs

10. What is prefix /27 in decimal notation?
255.255.255.224
255.255.255.252
Used by a host to obtain the IPv4 address associated with its own MAC address
1

11. What is TCP?
Transmission Control Protocol
DSCP (6-bit); ECN (2-bit)
All Internet Registries
Each router decrements the TTL

12. What is the content of the TCP Window Size field?
Application
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Transmission Control Protocol
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

13. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Network interface
Largest segment size that the sender is willing to accept
Internet Protocol
8

14. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
4
3
Socket

15. What is the minimum length of an IPv4 header?
ECN-Echo
Per-Hop Behaviour (PHB)
3
20 octets

16. Which IPv4 address range is reserved for use in documentation and example code?
192.0.2.0/24
NIRs
Local Internet Registry
4

17. What is added after the option field in the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
127.0.0.0/8
Reserved (1-bit); DF (1-bit); MF (1-bit)
0x0800

18. Which RFC defines the private IPv4 address ranges?
2
Final
RFC 1918
DSCP (6-bit); ECN (2-bit)

19. What is the prerequisite for using the Urgent Pointer field in the TCP header?
Sequence Numbers
169.254.0.0/16
IPv4 and IPv6
URG flag set

20. What is URG?
Router#debug arp
255.255.255.128
Urgent
RFC 791

21. Who administers and registers public IP address space and AS numbers within a country or economic unit?
NIRs
The next sequence number that the source expects to receive from the destination
Open Systems Interconnection
ICANN and IANA

22. What is ICMP Type 10?
Router Selection
Local Internet Registry
Maximum Segment Size (MSS)
Windowing

23. What is gratuitous ARP?
Used by a host to obtain the IP address associated with another host's MAC address
6
Push
An ARP request issued by a host with its own IPv4 address as the target address

24. What is the ARP Operation value for a Reverse ARP Request?
ICANN and IANA
3
Echo
RFC 1918

25. What is the function of ICMP router advertisement and router selection messages?
Sequence Number
Router Selection
Used by IRDP on some operating systems to discover local routers
Time Exceeded

26. Disables proxy ARP on all interfaces
47
Router(config)#ip arp proxy disable
The next sequence number that the source expects to receive from the destination
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

27. What are classful routing protocols?

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28. What is prefix /26 in decimal notation?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
URG flag set
255.255.255.192
Socket

29. What is ICANN?
Internet Corporation for Assigned Network Numbers
47
An ARP request issued by a host with its own IPv4 address as the target address
Subtract Header Length field from Total Length field

30. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
255.255.255.224
Per-Hop Behaviour (PHB)
RFC 3330

31. What are the private IPv4 address ranges?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Sequence Number
Uniquely identify every application in the network
1

32. What is OSI?
Open Systems Interconnection
An ARP request issued by a host with its own IPv4 address as the target address
DHCP
Local Internet Registry

33. What is the ARP Hardware address length value for Ethernet?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
6
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router Selection

34. What is the IPv4 Protocol number for IGMP?
Identifier; Flags and Fragmentation Offset
169.254.0.0/16
0.0.0.0/8
2

35. What is Inverse ARP?

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36. What are the uses of gratuitous ARP?
Time Exceeded
ECN-Echo
IANA
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

37. Enables debugging output for ARP transactions
255.255.255.192
Data Offset
Used by a host to obtain the IPv4 address associated with its own MAC address
Router#debug arp

38. What is the IPv4 Protocol number for TCP?
Router Selection
6
Redirect
60 octets

39. What is CWR?
255.255.255.240
Largest segment size that the sender is willing to accept
Congestion Window Reduced
Local Internet Registry

40. What is ICMP Type 11?
Time Exceeded
Push
Time to Live
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

41. What is the value of the TCP Reserved field?
DSCP (6-bit); ECN (2-bit)
0
Transmission Control Protocol
Push

42. What is the format of the DiffServ byte?
Internet Service Provider
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Used by a host to obtain the IP address associated with another host's MAC address
DSCP (6-bit); ECN (2-bit)

43. What is the IPv4 Protocol number for OSPF?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Reserved (1-bit); DF (1-bit); MF (1-bit)
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
89

44. Adds a permanent static ARP entry for an Ethernet host
2
Router(config)#arp {ip-address} {mac-address} arpa
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
255.255.255.192

45. What is ICMP Type 0?
Uniquely identify every application in the network
Loose source routing; Strict source routing; Record route; Timestamp
Router#show arp
Echo Reply

46. What is the maximum length of an IPv4 header?
Reset
Internet Corporation for Assigned Network Numbers
60 octets
Used by a host to obtain the IPv4 address associated with its own MAC address

47. What routing protocols are classful?
Final
RIPv1 and IGRP
Router(config-if)#no ip redirects
Acknowledgements - checksums and timers

48. What are classless routing protocols?
RIRs
192.0.2.0/24
Protocols that include subnet masks in their routing updates
0x0800

49. What is the format of a UDP header?
Sequence Numbers
89
Per-Hop Behaviour (PHB)
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

50. What is ICMP Type 8?
127.0.0.0/8
8
Echo
1