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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
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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 are classful routing protocols?

2. What is proxy ARP?
Internet
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
1
Loose source routing; Strict source routing; Record route; Timestamp

3. Who allocates public IP address ranges to NIRs or LIRs?
RIRs
Mostly large ISPs - enterprises - or academic institutions
Acknowledgement
3

4. What is the IPv4 Protocol number for TCP?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
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
6
2

5. What is ACK?
Reset
64
Internet Control Message Protocol
Acknowledgement

6. Which RFC defines the special use IPv4 address ranges?
Push
Reserved (1-bit); DF (1-bit); MF (1-bit)
RFC 3330
Internet Assigned Numbers Authority

7. What is added after the Option field in the TCP header?
The next sequence number that the source expects to receive from the destination
Internet
Padding of zeros to ensure that the header ends on a 32-bit boundary
Push

8. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
8
Network interface
Time to Live
Synchronize

9. Disables proxy ARP on an interface
Acknowledgements - checksums and timers
2
Router(config-if)#no ip proxy-arp
National Internet Registry

10. What is ICMP Type 11?
Each router decrements the TTL
Time Exceeded
Electrical/Optical - Mechanical - Functional and Procedural
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

11. What is the ARP Hardware type value for Ethernet?
Sequence Number
1
0.0.0.0/8
47

12. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
89
Per-Hop Behaviour (PHB)
Transmission Control Protocol

13. 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
Length of header in words (32-bit)
0
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

14. Who administers and registers public IP address space and AS numbers within a country or economic unit?
Internet
Identifier; Flags and Fragmentation Offset
NIRs
ECN-Echo

15. Which IPv4 address range is reserved for loopback testing?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Acknowledgement
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
127.0.0.0/8

16. What is ICMP Type 9?
Echo
RIPv1 and IGRP
Router#debug arp
Router Advertisement

17. What is the IPv4 Protocol number for ICMP?
1
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
6
127.0.0.0/8

18. What is ICMP Type 3?
60 octets
Destination Unreachable
Time to Live
6

19. What is prefix /30 in decimal notation?
255.255.255.252
Used by IRDP on some operating systems to discover local routers
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
8

20. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
88
IANA
Each router decrements the TTL
Sequence Number

21. What is the ARP Operation value for a Reverse ARP Request?
Maximum Segment Size (MSS)
RFC 3330
3
DSCP (6-bit); ECN (2-bit)

22. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Host-to-host
RIRs
Router Selection
Uniquely identify every application in the network

23. What is prefix /29 in decimal notation?
255.255.255.248
IANA
Socket
ICANN and IANA

24. What is SYN?
RIRs
2
Synchronize
4

25. What is FIN?
Socket
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Final
National Internet Registry

26. What is added after the option field in the IPv4 header?
Congestion Window Reduced
Push
Padding of zeros to ensure that the header ends on a 32-bit boundary
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

27. What is ICMP?
Internet Assigned Numbers Authority
An ARP request issued by a host with its own IPv4 address as the target address
Internet Control Message Protocol
Subtract Header Length field from Total Length field

28. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
6
60 octets
192.88.99.0/24
Acknowledgements - checksums and timers

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

30. What is RST?
Reset
88
The next sequence number that the source expects to receive from the destination
Protocols that include subnet masks in their routing updates

31. What is the TTL field in the IPv4 header?
ICMP Router Discovery Protocol
Reset
Urgent
Time to Live

32. What is the IPv4 Protocol number for IGMP?
Synchronize
Used by a host to obtain the IPv4 address associated with its own MAC address
2
127.0.0.0/8

33. What is IANA?
RIRs
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Internet Assigned Numbers Authority
DSCP (6-bit); ECN (2-bit)

34. Which IPv4 address range is reserved for self-identification on a local subnet?
RFC 791
Time to Live
0.0.0.0/8
IANA

35. Why must the header checksum of an IPv4 packet be recalculated at every router?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
89
Each router decrements the TTL
Maximum Segment Size (MSS)

36. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Application
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 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Internet Assigned Numbers Authority

37. Disables proxy ARP on all interfaces
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router(config)#ip arp proxy disable
Acknowledgements - checksums and timers
Internet Corporation for Assigned Network Numbers

38. What is the format of a TCP header?
2
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
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
Per-Hop Behaviour (PHB)

39. What IPv4 header fields are used for fragmentation?
Electrical/Optical - Mechanical - Functional and Procedural
All Internet Registries
Local Internet Registry
Identifier; Flags and Fragmentation Offset

40. What is RIR?
Regional Internet Registry
Maximum Segment Size (MSS)
0
Used by a host to obtain the IP address associated with another host's MAC address

41. What is ICMP Type 10?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Subtract Header Length field from Total Length field
Router Selection
8

42. What is PSH?
Push
Echo
RFC 1918
Echo Reply

43. What is TCP?
255.255.255.224
Subtract Header Length field from Total Length field
Transmission Control Protocol
Host-to-host

44. What is ARP?
Address Resolution Protocol
They are the same byte - but the names and value interpretations are different
Regional Internet Registry
Internet Service Provider

45. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Final
Network interface
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

46. What is the content of the TCP Window Size field?
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
Don't Fragment
IANA
Destination Unreachable

47. What is the format of the TCP Header Length field?
255.255.255.248
Length of header in words (32-bit)
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Congestion Window Reduced

48. What is ISP?
Destination Unreachable
Internet Service Provider
DHCP
Router Advertisement

49. What is the ARP Protocol address length value for IPv4?
4
More Fragments follow
60 octets
9

50. What is Inverse ARP?