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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 TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Host-to-host
RIPv1 and IGRP
Mostly large ISPs - enterprises - or academic institutions
60 octets

2. What is RIR?
169.254.0.0/16
Open Systems Interconnection
Regional Internet Registry
RFC 3330

3. What is the ARP Operation value for an ARP Request?
1
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
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
Acknowledgement

4. Disables proxy ARP on an interface
Electrical/Optical - Mechanical - Functional and Procedural
Redirect
Router(config-if)#no ip proxy-arp
3

5. What is Inverse ARP?

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6. What is the maximum length of an IPv4 header?
Router Advertisement
Subtract Header Length field from Total Length field
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
60 octets

7. What is TCP?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Transmission Control Protocol
89
Length of header in words (32-bit)

8. What is the format of an IPv4 header?
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);
DHCP
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
Router#debug arp

9. What is prefix /29 in decimal notation?
Local Internet Registry
255.255.255.248
Internet Assigned Numbers Authority
1

10. What is the IPv4 Protocol number for OSPF?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
89
Length of header in words (32-bit)
Internet

11. What are the protocol categories that describe the physical layer?
Protocols that include subnet masks in their routing updates
Electrical/Optical - Mechanical - Functional and Procedural
Urgent
Router Selection

12. What is the first octet rule for IPv4 address classes in binary?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
4
6
ICANN and IANA

13. What is PSH?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Used by IRDP on some operating systems to discover local routers
Internet
Push

14. What is prefix /27 in decimal notation?
Per-Hop Behaviour (PHB)
Don't Fragment
Used by IRDP on some operating systems to discover local routers
255.255.255.224

15. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
169.254.0.0/16
DSCP (6-bit); ECN (2-bit)
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router(config-if)#arp timeout {seconds}

16. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Sequence Number
Router#show arp
4
Host-to-host

17. Why must the header checksum of an IPv4 packet be recalculated at every router?
Router(config-if)#no ip redirects
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Each router decrements the TTL
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

18. Who allocates IP address space and AS numbers to RIRs?
Router Advertisement
Subtract Header Length field from Total Length field
IANA
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

19. What is the ARP Hardware address length value for Ethernet?
Protocols that don't include subnet masks in their routing updates
Sequence Number
6
Urgent

20. Which IPv4 address range is reserved for loopback testing?
Echo Reply
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
127.0.0.0/8
198.18.0.0/15

21. Who administers and registers IP address space and AS numbers within a region?
255.255.255.128
URG flag set
Uniquely identify every application in the network
RIRs

22. What is the name of the queuing and forwarding of IP packets based on DiffServ?
0
8
RFC 3330
Per-Hop Behaviour (PHB)

23. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Per-Hop Behaviour (PHB)
ICANN
127.0.0.0/8
Transmission Control Protocol

24. What is a TCP Acknowledgement Number?
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
ECN-Echo
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. Who group public IPv4 address space by major geographic region?
ICANN and IANA
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);
Internet Corporation for Assigned Network Numbers
255.255.255.128

26. What is the IPv4 protocol number for UDP?
NIRs
17
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
255.255.255.224

27. What is ICMP Type 5?
Both the TCP header and the encapsulated data
Redirect
Used by a host to obtain the IP address associated with another host's MAC address
More Fragments follow

28. What is ACK?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Router(config)#ip arp proxy disable
Used by a host to obtain the IPv4 address associated with its own MAC address
Acknowledgement

29. What is added after the option field in the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
IANA
Maximum Segment Size (MSS)
Each router decrements the TTL

30. What is gratuitous ARP?
They are the same byte - but the names and value interpretations are different
URG flag set
An ARP request issued by a host with its own IPv4 address as the target address
Router Advertisement

31. What is the format of the ToS byte in the IPv4 header?
ECN-Echo
1
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Data Offset

32. What are the private IPv4 address ranges?
Router Selection
Used by a host to obtain the IPv4 address associated with its own MAC address
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

33. What is the format of the TCP Header Length field?
More Fragments follow
255.255.255.240
Synchronize
Length of header in words (32-bit)

34. What is added after the Option field in the TCP header?
Acknowledgement
Echo
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
Padding of zeros to ensure that the header ends on a 32-bit boundary

35. What is proxy ARP?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Host-to-host
6
Internet Service Provider

36. What is the value of the TCP Reserved field?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Uniquely identify every application in the network
Largest segment size that the sender is willing to accept
0

37. What is the format of a TCP header?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
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
Protocols that don't include subnet masks in their routing updates
NIRs

38. What is the format of the Flags field in the IPv4 header?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Transmission Control Protocol
Reserved (1-bit); DF (1-bit); MF (1-bit)
Don't Fragment

39. Enables debugging output for ARP transactions
Reset
Used by a host to obtain the IPv4 address associated with its own MAC address
ECN-Echo
Router#debug arp

40. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Time Exceeded
64
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
IANA

41. What is ICMP Type 11?
Urgent
4
Sequence Number + Data payload octets + 1
Time Exceeded

42. What are classful routing protocols?

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43. What is the ARP Protocol type value for IPv4?
47
64
Padding of zeros to ensure that the header ends on a 32-bit boundary
0x0800

44. What is ICMP?
Internet Control Message Protocol
Electrical/Optical - Mechanical - Functional and Procedural
Router(config-if)#arp timeout {seconds}
URG flag set

45. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Sequence Number + Data payload octets + 1
RFC 3330
198.18.0.0/15
47

46. Who are LIRs?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Mostly large ISPs - enterprises - or academic institutions
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
46

47. What are the most frequently used options in the IPv4 header?
3
Loose source routing; Strict source routing; Record route; Timestamp
ICMP Router Discovery Protocol
Router#show arp

48. What is the content of the the Urgent Pointer field in the TCP header?
4
They are the same byte - but the names and value interpretations are different
Acknowledgements - checksums and timers
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

49. What is the format of a UDP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Socket
Router Advertisement
4

50. What routing protocols are classful?
255.255.255.224
ICMP Router Discovery Protocol
RIPv1 and IGRP
4