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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 ACK?
Network interface
2
60 octets
Acknowledgement

2. What is Reverse ARP?
Used by a host to obtain the IPv4 address associated with its own MAC address
46
4
9

3. What is the format of the DiffServ byte?
Router#debug arp
DSCP (6-bit); ECN (2-bit)
Identifier; Flags and Fragmentation Offset
Router(config-if)#arp timeout {seconds}

4. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
1
198.18.0.0/15
Router(config-if)#no ip proxy-arp
Network interface

5. What is a TCP Acknowledgement Number?
Redirect
The next sequence number that the source expects to receive from the destination
127.0.0.0/8
Urgent

6. What is the ARP Protocol address length value for IPv4?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
4
255.255.255.224
Internet Service Provider

7. What is IRDP?
Final
ICMP Router Discovery Protocol
An ARP request issued by a host with its own IPv4 address as the target address
Acknowledgement

8. What is the IPv4 Protocol number for IP in IP encapsulation?
169.254.0.0/16
Internet
4
Loose source routing; Strict source routing; Record route; Timestamp

9. What is prefix /28 in decimal notation?
192.88.99.0/24
255.255.255.240
Transmission Control Protocol
Internet Control Message Protocol

10. What is the IPv4 Protocol number for EIGRP?
Router#show arp
DSCP (6-bit); ECN (2-bit)
46
88

11. What mechanism is used by TCP to regulate the flow of segments?
Windowing
198.18.0.0/15
Reset
Urgent

12. What is NIR?
Regional Internet Registry
Router Selection
National Internet Registry
ECN-Echo

13. Disables proxy ARP on all interfaces
Used by a host to obtain the IP address associated with another host's MAC address
Router(config)#ip arp proxy disable
1
Network interface

14. What is the ARP Operation value for an ARP Request?
192.88.99.0/24
Padding of zeros to ensure that the header ends on a 32-bit boundary
ICANN
1

15. 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
64
192.88.99.0/24
2

16. Which IPv4 address range is reserved for self-identification on a local subnet?
DSCP (6-bit); ECN (2-bit)
0.0.0.0/8
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Maximum Segment Size (MSS)

17. What is ICMP Type 8?
Host-to-host
Echo
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

18. What is Inverse ARP?

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19. What is prefix /25 in decimal notation?
4
4
More Fragments follow
255.255.255.128

20. What is proxy ARP?
Used by IRDP on some operating systems to discover local routers
Sequence Numbers
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
6

21. What is ICMP Type 11?
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
RIRs
Uniquely identify every application in the network
Time Exceeded

22. What is the value of the TCP Reserved field?
0
Congestion Window Reduced
Loose source routing; Strict source routing; Record route; Timestamp
0x0800

23. Who allocates public IP address ranges to NIRs or LIRs?
2
Router(config-if)#arp timeout {seconds}
RIRs
Host-to-host

24. What is the maximum length of an IPv4 header?
All Internet Registries
60 octets
255.255.255.224
Host-to-host

25. What is the content of the TCP Window Size field?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router(config-if)#arp timeout {seconds}
Acknowledgement
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

26. What is ICMP?
Both the TCP header and the encapsulated data
Internet Control Message Protocol
Address Resolution Protocol
Internet Corporation for Assigned Network Numbers

27. What is ICMP Type 3?
17
8
Destination Unreachable
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

28. What is the most commonly used Option field in the TCP header?
Socket
Maximum Segment Size (MSS)
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Protocols that don't include subnet masks in their routing updates

29. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
Router#show arp
Open Systems Interconnection
RFC 791

30. What are the private IPv4 address ranges?
198.18.0.0/15
Host-to-host
Final
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

31. What is IP?
0x0800
Time to Live
Internet Protocol
Acknowledgements - checksums and timers

32. What is the IPv4 Protocol number for IGMP?
Padding of zeros to ensure that the header ends on a 32-bit boundary
2
Socket
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

33. What is the ARP Hardware address length value for Ethernet?
6
1
Acknowledgement
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

34. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
IANA
Congestion Window Reduced
192.0.2.0/24
An ARP request issued by a host with its own IPv4 address as the target address

35. What is the format of the ToS byte in the IPv4 header?
1
Echo
Identifier; Flags and Fragmentation Offset
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

36. Deletes dynamic entries from the ARP cache
Network interface
Acknowledgements - checksums and timers
Acknowledgement
Router#clear arp-cache [{interface {interface}} | {ip-address}]

37. What is the content of the the Urgent Pointer field in the TCP header?
46
ICANN and IANA
URG flag set
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

38. What is added after the option field in the IPv4 header?
0x0800
Padding of zeros to ensure that the header ends on a 32-bit boundary
Address Resolution Protocol
Internet

39. What are the uses of gratuitous ARP?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
1
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

40. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Internet
Don't Fragment
Application
Time Exceeded

41. What is CWR?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Internet Protocol
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
Congestion Window Reduced

42. What is URG?
Urgent
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Acknowledgement
DSCP (6-bit); ECN (2-bit)

43. What is prefix /26 in decimal notation?
Acknowledgement
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);
Each router decrements the TTL
255.255.255.192

44. Which IPv4 address range is reserved for loopback testing?
Length of header in words (32-bit)
RFC 1918
Sequence Number
127.0.0.0/8

45. What is the Fragment Offset field in the IPv4 header?
255.255.255.248
255.255.255.252
9
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

46. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
0
Sequence Number + Data payload octets + 1
LIRs

47. What are classless routing protocols?
0
Protocols that include subnet masks in their routing updates
Router(config)#ip arp proxy disable
LIRs

48. Which RFC defines IPv4?
RFC 791
255.255.255.128
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Router(config)#arp {ip-address} {mac-address} arpa

49. What is IANA?
Internet Assigned Numbers Authority
RIRs
Internet Control Message Protocol
Internet

50. What is the prerequisite for using the Urgent Pointer field in the TCP header?
URG flag set
Loose source routing; Strict source routing; Record route; Timestamp
20 octets
ICMP Router Discovery Protocol