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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 ARP Operation value for an Inverse ARP Request?
Application
8
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
60 octets

2. What is the ARP Protocol type value for IPv4?
0x0800
2
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);
An ARP request issued by a host with its own IPv4 address as the target address

3. What is the IPv4 Protocol number for OSPF?
192.88.99.0/24
Internet Protocol
Router#clear arp-cache [{interface {interface}} | {ip-address}]
89

4. What is the minimum length of an IPv4 header?
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
RIPv1 and IGRP
Router(config-if)#no ip redirects
20 octets

5. What is the content of the the Urgent Pointer field in the TCP header?
0
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
LIRs

6. What are classful routing protocols?

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7. What is the maximum length of an IPv4 header?
Internet Assigned Numbers Authority
Router#show arp
DHCP
60 octets

8. What are the uses of gratuitous ARP?
Used by IRDP on some operating systems to discover local routers
RFC 1918
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Mostly large ISPs - enterprises - or academic institutions

9. What is added after the Option field in the TCP header?
Protocols that include subnet masks in their routing updates
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Padding of zeros to ensure that the header ends on a 32-bit boundary
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

10. What mechanism is used by TCP to regulate the flow of segments?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Windowing
89
IPv4 and IPv6

11. What is the format of the ToS byte in the IPv4 header?
255.255.255.248
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Used by a host to obtain the IPv4 address associated with its own MAC address
Redirect

12. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Subtract Header Length field from Total Length field
4
4
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

13. What is Reverse ARP?
IANA
Used by a host to obtain the IPv4 address associated with its own MAC address
Reserved (1-bit); DF (1-bit); MF (1-bit)
Destination Unreachable

14. What is the ARP Hardware type value for Ethernet?
RFC 1918
1
Local Internet Registry
Internet

15. What is the format of the Flags field in the TCP header?
Sequence Numbers
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Internet
Network interface

16. Which IPv4 address range is reserved for loopback testing?
Socket
Urgent
17
127.0.0.0/8

17. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
255.255.255.128
1

18. What is the function of ICMP redirect messages?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Reserved (1-bit); DF (1-bit); MF (1-bit)
RIRs
Router#debug arp

19. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Router(config)#arp {ip-address} {mac-address} arpa
4
IANA
Router#show arp

20. Which IPv4 address range is reserved for use in documentation and example code?
192.0.2.0/24
0
Maximum Segment Size (MSS)
6

21. What is the content of the TCP Window Size field?
Acknowledgements - checksums and timers
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
1
LIRs

22. What is the format of a UDP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
192.88.99.0/24
Sequence Numbers

23. What is the format of the TCP Header Length field?
IANA
Host-to-host
Length of header in words (32-bit)
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

24. What is the most commonly used Option field in the TCP header?
Regional Internet Registry
Protocols that include subnet masks in their routing updates
Maximum Segment Size (MSS)
Congestion Window Reduced

25. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
47
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Internet

26. Who allocates IP address space and AS numbers to RIRs?
60 octets
Push
IANA
255.255.255.224

27. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Maximum Segment Size (MSS)
ICANN
Host-to-host
255.255.255.252

28. What is the ARP Operation value for a Reverse ARP Reply?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
4
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

29. What is ICMP Type 9?
Router#debug arp
Push
255.255.255.248
Router Advertisement

30. What is ACK?
Protocols that include subnet masks in their routing updates
IANA
Acknowledgement
Network interface

31. What is prefix /25 in decimal notation?
IANA
255.255.255.128
Data Offset
Router(config-if)#arp timeout {seconds}

32. What is ICMP Type 10?
Router Selection
They are the same byte - but the names and value interpretations are different
Electrical/Optical - Mechanical - Functional and Procedural
Time to Live

33. What is prefix /29 in decimal notation?
64
4
Router(config-if)#arp timeout {seconds}
255.255.255.248

34. What is prefix /26 in decimal notation?
Echo
0x0800
255.255.255.192
127.0.0.0/8

35. What is the the MF-bit in the IPv4 header?
255.255.255.240
2
More Fragments follow
Regional Internet Registry

36. What is IP?
Router(config)#ip arp proxy disable
Used by IRDP on some operating systems to discover local routers
Internet Protocol
255.255.255.252

37. What is a TCP Acknowledgement Number?
Largest segment size that the sender is willing to accept
The next sequence number that the source expects to receive from the destination
64
4

38. What is RIR?
Regional Internet Registry
Transmission Control Protocol
Uniquely identify every application in the network
Acknowledgement

39. Who allocates public IP address ranges to NIRs or LIRs?
RIRs
Transmission Control Protocol
Internet Corporation for Assigned Network Numbers
RIPv1 and IGRP

40. Who administers and registers IP address space and AS numbers within a region?
RIPv1 and IGRP
RIRs
Redirect
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

41. What are the most frequently used options in the IPv4 header?
More Fragments follow
Acknowledgements - checksums and timers
IANA
Loose source routing; Strict source routing; Record route; Timestamp

42. What is the DF-bit in the IPv4 header?

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43. Who assigns IP address space to its own customers?
LIRs
Redirect
Open Systems Interconnection
6

44. What is the Fragment Offset field in the IPv4 header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Echo
RFC 791
Open Systems Interconnection

45. What are the steps to subnet an IPv4 address?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Uniquely identify every application in the network
Don't Fragment
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

46. What mechanism is used by TCP to provided ordered segment delivery?
Sequence Numbers
1
6
All Internet Registries

47. What is the format of the ToS field?
Echo
Time Exceeded
255.255.255.240
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

48. What is Inverse ARP?

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49. What is the IPv4 Protocol number for ICMP?
255.255.255.192
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
1
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

50. Disables proxy ARP on an interface
Urgent
Internet Service Provider
192.88.99.0/24
Router(config-if)#no ip proxy-arp