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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. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Sequence Number
IANA
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address
Loose source routing; Strict source routing; Record route; Timestamp

2. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
89
169.254.0.0/16
192.0.2.0/24
4

3. What are classless routing protocols?
Identifier; Flags and Fragmentation Offset
Loose source routing; Strict source routing; Record route; Timestamp
Protocols that include subnet masks in their routing updates
1

4. What is ICMP Type 11?
RFC 1918
Padding of zeros to ensure that the header ends on a 32-bit boundary
Time Exceeded
Used by a host to obtain the IPv4 address associated with its own MAC address

5. What is the ARP Hardware address length value for Ethernet?
Synchronize
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
6
IANA

6. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
Congestion Window Reduced
192.0.2.0/24
Reserved (1-bit); DF (1-bit); MF (1-bit)

7. What is the IPv4 Protocol number for ICMP?
1
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Protocols that include subnet masks in their routing updates

8. What is IANA?
Internet Assigned Numbers Authority
Host-to-host
20 octets
URG flag set

9. What IPv4 header fields are used for fragmentation?
Protocols that include subnet masks in their routing updates
Acknowledgements - checksums and timers
Identifier; Flags and Fragmentation Offset
255.255.255.248

10. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Per-Hop Behaviour (PHB)
National Internet Registry
Internet Control Message Protocol
RFC 3330

11. What is the ARP Operation value for a Reverse ARP Reply?
4
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
255.255.255.224
0.0.0.0/8

12. What is the ARP Operation value for an ARP Reply?
2
IANA
Each router decrements the TTL
Local Internet Registry

13. Who assigns IP address space to its own customers?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Sequence Numbers
NIRs
LIRs

14. Who administers and registers public IP address space and AS numbers within a country or economic unit?
3
NIRs
RFC 791
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

15. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
255.255.255.128
Padding of zeros to ensure that the header ends on a 32-bit boundary
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address

16. Adds a permanent static ARP entry for an Ethernet host
4
Router(config)#ip arp proxy disable
Router(config)#arp {ip-address} {mac-address} arpa
4

17. What is the maximum length of an IPv4 header?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
RFC 791
60 octets
4

18. What is RST?
Local Internet Registry
Used by IRDP on some operating systems to discover local routers
4
Reset

19. Disables proxy ARP on all interfaces
255.255.255.224
Router(config-if)#arp timeout {seconds}
Final
Router(config)#ip arp proxy disable

20. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
Sequence Numbers
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
6

21. Who allocates public IP address ranges to NIRs or LIRs?
National Internet Registry
ECN-Echo
RIRs
Final

22. What is the TTL field in the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Time to Live
192.0.2.0/24
255.255.255.240

23. What is a TCP port number of an application called when it is coupled with the IP address of the server?
IANA
Socket
RIRs
They are the same byte - but the names and value interpretations are different

24. Deletes dynamic entries from the ARP cache
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address
IANA
20 octets

25. Enables debugging output for ARP transactions
Router#debug arp
Sequence Numbers
Uniquely identify every application in the network
Largest segment size that the sender is willing to accept

26. What is the IPv4 Protocol number for GRE?
ICANN
46
Echo Reply
47

27. What is FIN?
127.0.0.0/8
Sequence Numbers
Final
255.255.255.240

28. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Network interface
Both the TCP header and the encapsulated data
255.255.255.192
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

29. What is the format of an ARP packet?
17
Loose source routing; Strict source routing; Record route; Timestamp
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address
169.254.0.0/16

30. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Sequence Number + Data payload octets + 1
Time Exceeded
127.0.0.0/8

31. What is the format of the ToS field?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Internet Assigned Numbers Authority
Used by a host to obtain the IPv4 address associated with its own MAC address
ICANN

32. What is TCP?
Regional Internet Registry
Transmission Control Protocol
0x0800
Sequence Numbers

33. What are the IP Precedence values?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Reset
89
Urgent

34. Who group public IPv4 address space by major geographic region?
Mostly large ISPs - enterprises - or academic institutions
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
ICANN and IANA
255.255.255.252

35. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
ICANN and IANA
IANA
Internet Assigned Numbers Authority
47

36. What is the format of the DiffServ byte?
3
DSCP (6-bit); ECN (2-bit)
Time to Live
Don't Fragment

37. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
RIRs
Router#debug arp
Used by IRDP on some operating systems to discover local routers

38. What is the IPv4 protocol number for UDP?
Transmission Control Protocol
88
Congestion Window Reduced
17

39. What is CWR?
0.0.0.0/8
17
2
Congestion Window Reduced

40. What is ACK?
Data Offset
Congestion Window Reduced
0
Acknowledgement

41. What is Inverse ARP?

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42. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
0.0.0.0/8
Destination Unreachable
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

43. What is the IPv4 Protocol number for OSPF?
IANA
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address
More Fragments follow
89

44. What are the private IPv4 address ranges?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
255.255.255.192
1
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

45. What is the first octet rule for IPv4 address classes in decimal?
Sequence Numbers
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
RFC 1918
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

46. What is SYN?
Subtract Header Length field from Total Length field
Acknowledgement
Synchronize
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

47. What is ECE?
Per-Hop Behaviour (PHB)
Padding of zeros to ensure that the header ends on a 32-bit boundary
ECN-Echo
Sequence Number + Data payload octets + 1

48. What is OSI?
0.0.0.0/8
Open Systems Interconnection
RIRs
Windowing

49. What is the format of the ToS byte in the IPv4 header?
Push
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
169.254.0.0/16

50. What is ICMP Type 0?
Don't Fragment
Regional Internet Registry
Router(config)#ip arp proxy disable
Echo Reply