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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 content of the TCP Window Size field?
Reset
1
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
60 octets

2. What is prefix /25 in decimal notation?
Time Exceeded
0x0800
ECN-Echo
255.255.255.128

3. What is LIR?
All Internet Registries
URG flag set
Local Internet Registry
127.0.0.0/8

4. What is prefix /28 in decimal notation?
Used by a host to obtain the IPv4 address associated with its own MAC address
255.255.255.240
Protocols that include subnet masks in their routing updates
255.255.255.192

5. What is the IPv4 Protocol number for GRE?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
RIPv1 and IGRP
47
Host-to-host

6. Disables the sending of ICMP redirect messages
Router(config-if)#no ip redirects
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Both the TCP header and the encapsulated data

7. What is the the MF-bit in the IPv4 header?
Local Internet Registry
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
255.255.255.240
More Fragments follow

8. What is the ARP Operation value for an Inverse ARP Reply?
9
Final
Internet
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

9. What are the most common IP version numbers?
Echo Reply
Router(config-if)#arp timeout {seconds}
Transmission Control Protocol
IPv4 and IPv6

10. What is gratuitous ARP?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
An ARP request issued by a host with its own IPv4 address as the target address
Router#debug arp
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

11. What is the format of an IPv4 header?
127.0.0.0/8
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
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
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);

12. What is ARP?
Protocols that don't include subnet masks in their routing updates
Address Resolution Protocol
Echo
Network interface

13. Which RFC defines IPv4?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
RFC 791
169.254.0.0/16
Echo Reply

14. What is the ARP Protocol address length value for IPv4?
RIRs
4
255.255.255.192
NIRs

15. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Internet
RIRs
Used by IRDP on some operating systems to discover local routers
Application

16. What is covered by the TCP Checksum field?
RIPv1 and IGRP
Router#debug arp
Internet Protocol
Both the TCP header and the encapsulated data

17. What is RIR?
Regional Internet Registry
IANA
8
89

18. What is IRDP?
RFC 3330
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
ICMP Router Discovery Protocol
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

19. Who administers and registers IP address space and AS numbers within a region?
60 octets
RIRs
64
Length of header in words (32-bit)

20. What are the uses of gratuitous ARP?
Subtract Header Length field from Total Length field
Internet Control Message Protocol
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Used by a host to obtain the IP address associated with another host's MAC address

21. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Host-to-host
192.88.99.0/24
Reset
255.255.255.128

22. What is ICMP Type 9?
1
Router Advertisement
LIRs
RIRs

23. What is ICMP Type 0?
6
IANA
Transmission Control Protocol
Echo Reply

24. Who allocates IP address space and AS numbers to RIRs?
Echo
IANA
8
Loose source routing; Strict source routing; Record route; Timestamp

25. Who allocates public IP address ranges to NIRs or LIRs?
RIRs
Uniquely identify every application in the network
All Internet Registries
255.255.255.248

26. What is the format of the TCP Header Length field?
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
Length of header in words (32-bit)
Reserved (1-bit); DF (1-bit); MF (1-bit)
192.88.99.0/24

27. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Electrical/Optical - Mechanical - Functional and Procedural
IANA
Sequence Number + Data payload octets + 1
Time to Live

28. What is the minimum length of an IPv4 header?
Network interface
20 octets
Router(config-if)#no ip proxy-arp
6

29. What is the format of the Flags field in the IPv4 header?
Socket
Reserved (1-bit); DF (1-bit); MF (1-bit)
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
1

30. What mechanism is used by TCP to provided ordered segment delivery?
DSCP (6-bit); ECN (2-bit)
Sequence Number
Used by IRDP on some operating systems to discover local routers
Sequence Numbers

31. What is ICMP Type 3?
Open Systems Interconnection
RIRs
192.88.99.0/24
Destination Unreachable

32. What is ECE?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
ECN-Echo
2
ICMP Router Discovery Protocol

33. What is IANA?
Urgent
Internet
60 octets
Internet Assigned Numbers Authority

34. What is the TTL field in the IPv4 header?
1
Time to Live
Largest segment size that the sender is willing to accept
Router(config)#ip arp proxy disable

35. What is added after the option field in the IPv4 header?
Application
192.0.2.0/24
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router(config)#ip arp proxy disable

36. What is IP?
Router Selection
1
Router(config)#ip arp proxy disable
Internet Protocol

37. What is the first octet rule for IPv4 address classes in decimal?
Sequence Number
Subtract Header Length field from Total Length field
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Used by IRDP on some operating systems to discover local routers

38. 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)
4
Congestion Window Reduced
Internet Assigned Numbers Authority

39. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
Local Internet Registry
Echo
169.254.0.0/16
192.0.2.0/24

40. Which IPv4 address range is reserved for loopback testing?
Mostly large ISPs - enterprises - or academic institutions
Congestion Window Reduced
127.0.0.0/8
Don't Fragment

41. What is the purpose of a socket?
Urgent
Uniquely identify every application in the network
1
255.255.255.224

42. What is the IPv4 Protocol number for OSPF?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
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);
Application
89

43. What is the ARP Hardware address length value for Ethernet?
DHCP
Windowing
6
ICMP Router Discovery Protocol

44. What is the IPv4 protocol number for UDP?
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
Application
17
Local Internet Registry

45. What is URG?
Internet Control Message Protocol
RIRs
Open Systems Interconnection
Urgent

46. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Subtract Header Length field from Total Length field
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Host-to-host
Don't Fragment

47. Specifies the format in which subnet masks are displayed in show command output
Mostly large ISPs - enterprises - or academic institutions
Internet Protocol
Used by a host to obtain the IPv4 address associated with its own MAC address
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

48. What is prefix /30 in decimal notation?
255.255.255.252
RIRs
64
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

49. What IPv4 header fields are used for fragmentation?
ICANN and IANA
Time to Live
60 octets
Identifier; Flags and Fragmentation Offset

50. What is FIN?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
192.88.99.0/24
Final
All Internet Registries