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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 ICMP?
Internet Control Message Protocol
RFC 3330
Local Internet Registry
Address Resolution Protocol

2. What is OSI?
IANA
3
ICMP Router Discovery Protocol
Open Systems Interconnection

3. What is the format of the ToS field?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Internet Assigned Numbers Authority
Echo Reply

4. What is Inverse ARP?

5. What is NIR?
LIRs
6
169.254.0.0/16
National Internet Registry

6. What is the purpose of a socket?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Urgent
Uniquely identify every application in the network
Acknowledgement

7. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
Urgent
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
255.255.255.240

8. What is gratuitous ARP?
Per-Hop Behaviour (PHB)
Router(config-if)#no ip proxy-arp
An ARP request issued by a host with its own IPv4 address as the target address
RFC 1918

9. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
ICANN
20 octets
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Internet

10. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Reset
Host-to-host
4
Router#clear arp-cache [{interface {interface}} | {ip-address}]

11. What is PSH?
Push
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
Router#clear arp-cache [{interface {interface}} | {ip-address}]

12. Why must the header checksum of an IPv4 packet be recalculated at every router?
88
Router(config-if)#no ip proxy-arp
Each router decrements the TTL
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

13. Which RFC defines the private IPv4 address ranges?
NIRs
Uniquely identify every application in the network
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
RFC 1918

14. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Router(config-if)#no ip redirects
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
3
Network interface

15. What are the protocol categories that describe the physical layer?
255.255.255.252
Electrical/Optical - Mechanical - Functional and Procedural
Router Selection
89

16. What is the IPv4 Protocol number for TCP?
6
Protocols that include subnet masks in their routing updates
RFC 3330
20 octets

17. What is RIR?
ICANN and IANA
Network interface
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Regional Internet Registry

18. What routing protocols are classful?
RIPv1 and IGRP
17
Echo Reply
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

19. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Internet
Application
Address Resolution Protocol
9

20. What is ISP?
Internet Service Provider
64
More Fragments follow
Local Internet Registry

21. Specifies the format in which subnet masks are displayed in show command output
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
2
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Each router decrements the TTL

22. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
IANA
DHCP
Redirect

23. What is the maximum length of an IPv4 header?
Used by IRDP on some operating systems to discover local routers
Open Systems Interconnection
60 octets
255.255.255.128

24. What is the format of the DiffServ byte?
0
Internet Control Message Protocol
Open Systems Interconnection
DSCP (6-bit); ECN (2-bit)

25. What is the ARP Operation value for a Reverse ARP Reply?
Router Advertisement
4
Identifier; Flags and Fragmentation Offset
Echo

26. What is the content of the TCP Window Size field?
RFC 791
Router#show arp
Protocols that don't include subnet masks in their routing updates
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

27. What is the IPv4 Protocol number for ICMP?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Router(config)#arp {ip-address} {mac-address} arpa
1
Synchronize

28. What are the most common IP version numbers?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Socket
IPv4 and IPv6
Router#show arp

29. Who can assign IP address space to end user organizations?
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
All Internet Registries
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Protocols that include subnet masks in their routing updates

30. What is prefix /26 in decimal notation?
255.255.255.192
46
192.88.99.0/24
ECN-Echo

31. What is the IPv4 Protocol number for EIGRP?
88
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
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
Address Resolution Protocol

32. What is the IPv4 Protocol number of RSVP?
6
Router(config)#ip arp proxy disable
46
Congestion Window Reduced

33. What is prefix /25 in decimal notation?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Don't Fragment
255.255.255.128
2

34. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
RFC 3330
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
ICANN
0x0800

35. Disables proxy ARP on an interface
255.255.255.248
Protocols that include subnet masks in their routing updates
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router(config-if)#no ip proxy-arp

36. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Per-Hop Behaviour (PHB)
Transmission Control Protocol
Acknowledgement
ICMP Router Discovery Protocol

37. What is the format of a TCP header?
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
Transmission Control Protocol
Internet Corporation for Assigned Network Numbers
0.0.0.0/8

38. What is the prerequisite for using the Urgent Pointer field in the TCP header?
URG flag set
IPv4 and IPv6
Final
RIPv1 and IGRP

39. Who administers and registers public IP address space and AS numbers within a country or economic unit?
NIRs
Internet Control Message Protocol
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
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);

40. What is the the MF-bit in the IPv4 header?
More Fragments follow
Transmission Control Protocol
255.255.255.224
Address Resolution Protocol

41. What is the ARP Operation value for an ARP Reply?
IPv4 and IPv6
255.255.255.248
Acknowledgement
2

42. What are classless routing protocols?
Time Exceeded
Protocols that don't include subnet masks in their routing updates
Protocols that include subnet masks in their routing updates
ECN-Echo

43. What is prefix /27 in decimal notation?
8
255.255.255.224
Host-to-host
Address Resolution Protocol

44. What is the other name for the TCP Header Length field?
89
198.18.0.0/15
88
Data Offset

45. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
Router(config-if)#arp timeout {seconds}
Echo
4

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

47. What is the ARP Protocol address length value for IPv4?
4
Padding of zeros to ensure that the header ends on a 32-bit boundary
Application
ICMP Router Discovery Protocol

48. What is FIN?
3
Data Offset
Final
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

49. What are the steps to subnet an IPv4 address?
Sequence Number
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
1
Don't Fragment

50. What is the IPv4 Protocol number for OSPF?
Internet Corporation for Assigned Network Numbers
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
60 octets
89