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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. Disables proxy ARP on an interface
Router(config-if)#arp timeout {seconds}
198.18.0.0/15
RFC 3330
Router(config-if)#no ip proxy-arp

2. Which RFC defines the special use IPv4 address ranges?
RFC 3330
Data Offset
Reset
Network interface

3. What is IP?
Internet Protocol
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router Selection
RFC 791

4. What is the difference between the ToS and the DiffServ byte?
They are the same byte - but the names and value interpretations are different
Acknowledgement
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
National Internet Registry

5. What is the IPv4 Protocol number for IGMP?
255.255.255.252
RFC 1918
2
Socket

6. What is ICMP Type 10?
Urgent
Largest segment size that the sender is willing to accept
Router Selection
255.255.255.192

7. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
ICANN and IANA
Sequence Number + Data payload octets + 1
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Both the TCP header and the encapsulated data

8. Which RFC defines the private IPv4 address ranges?
Destination Unreachable
Host-to-host
Uniquely identify every application in the network
RFC 1918

9. What is the recommended default TTL?
64
Destination Unreachable
Transmission Control Protocol
4

10. What is PSH?
192.88.99.0/24
Push
ICMP Router Discovery Protocol
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

11. What is the IPv4 Protocol number for OSPF?
Push
Internet Service Provider
Router Advertisement
89

12. What is Inverse ARP?

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13. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
IANA
255.255.255.240

14. What are classless routing protocols?
Local Internet Registry
Protocols that include subnet masks in their routing updates
2
6

15. What are the steps to subnet an IPv4 address?
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
Time Exceeded
255.255.255.224
Push

16. What is CWR?
Congestion Window Reduced
255.255.255.252
47
Router#show arp

17. What is covered by the TCP Checksum field?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Time Exceeded
Internet Corporation for Assigned Network Numbers
Both the TCP header and the encapsulated data

18. What is the ARP Operation value for an Inverse ARP Reply?
Largest segment size that the sender is willing to accept
9
Socket
Transmission Control Protocol

19. Why must the header checksum of an IPv4 packet be recalculated at every router?
Sequence Numbers
ICANN
IANA
Each router decrements the TTL

20. What is the first octet rule for IPv4 address classes in binary?
RFC 1918
255.255.255.252
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
60 octets

21. What is ARP?
4
Address Resolution 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
Final

22. What is prefix /25 in decimal notation?
255.255.255.128
They are the same byte - but the names and value interpretations are different
Both the TCP header and the encapsulated data
Open Systems Interconnection

23. What is ACK?
National Internet Registry
Internet Protocol
Transmission Control Protocol
Acknowledgement

24. What is the content of the the Urgent Pointer field in the TCP header?
More Fragments follow
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
The next sequence number that the source expects to receive from the destination

25. What is the IPv4 Protocol number of RSVP?
Reset
Final
198.18.0.0/15
46

26. What is SYN?
RIPv1 and IGRP
Windowing
Internet Service Provider
Synchronize

27. What are classful routing protocols?

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28. What is the format of an ARP packet?
All Internet Registries
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
Don't Fragment
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

29. What is the the MF-bit in the IPv4 header?
Open Systems Interconnection
More Fragments follow
255.255.255.240
Congestion Window Reduced

30. What is the ARP Operation value for an Inverse ARP Request?
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
Time Exceeded
IANA
8

31. What is the most commonly used Option field in the TCP header?
Maximum Segment Size (MSS)
Per-Hop Behaviour (PHB)
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

32. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Used by a host to obtain the IPv4 address associated with its own MAC address
Internet
46
Router#debug arp

33. Who allocates public IP address ranges to NIRs or LIRs?
RIRs
Sequence Numbers
Local Internet Registry
ICANN

34. What is the content of the TCP Window Size field?
RIRs
2
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
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

35. What is the IPv4 Protocol number for ICMP?
1
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Internet Corporation for Assigned Network Numbers
Length of header in words (32-bit)

36. Which RFC defines IPv4?
RFC 791
17
Padding of zeros to ensure that the header ends on a 32-bit boundary
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

37. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
All Internet Registries
Padding of zeros to ensure that the header ends on a 32-bit boundary
169.254.0.0/16
2

38. What is the other name for the TCP Header Length field?
They are the same byte - but the names and value interpretations are different
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
4
Data Offset

39. What is the IPv4 Protocol number for GRE?
Used by a host to obtain the IPv4 address associated with its own MAC address
URG flag set
The next sequence number that the source expects to receive from the destination
47

40. Enables debugging output for ARP transactions
RIPv1 and IGRP
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);
Echo Reply
Router#debug arp

41. What is the minimum length of an IPv4 header?
They are the same byte - but the names and value interpretations are different
20 octets
Time to Live
198.18.0.0/15

42. Which IPv4 address range is reserved for use in documentation and example code?
192.0.2.0/24
An ARP request issued by a host with its own IPv4 address as the target address
6
Time to Live

43. What is ICMP Type 9?
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
IPv4 and IPv6
Router Advertisement
URG flag set

44. What is the ARP Protocol type value for IPv4?
Echo
Loose source routing; Strict source routing; Record route; Timestamp
0x0800
Internet

45. What mechanism is used by TCP to regulate the flow of segments?
169.254.0.0/16
LIRs
Windowing
Mostly large ISPs - enterprises - or academic institutions

46. What is added after the Option field in the TCP header?
192.0.2.0/24
Reserved (1-bit); DF (1-bit); MF (1-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary
Echo Reply

47. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
255.255.255.240
IANA
Subtract Header Length field from Total Length field
Router(config-if)#no ip redirects

48. What is RIR?
Acknowledgement
Regional Internet Registry
Protocols that don't include subnet masks in their routing updates
National Internet Registry

49. What is prefix /30 in decimal notation?
255.255.255.252
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
255.255.255.224

50. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Push
All Internet Registries
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application