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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 IPv4 protocol number for UDP?
Redirect
Acknowledgements - checksums and timers
Application
17

2. What is CWR?
Congestion Window Reduced
Internet Protocol
Windowing
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

3. What is ISP?
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 Service Provider
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

4. What is the ARP Operation value for an Inverse ARP Reply?
255.255.255.248
More Fragments follow
0
9

5. What is the value of the TCP Reserved field?
Protocols that include subnet masks in their routing updates
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Application
0

6. What are the steps to subnet an IPv4 address?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
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
17

7. Who can assign IP address space to end user organizations?
Router(config)#arp {ip-address} {mac-address} arpa
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
All Internet Registries
Loose source routing; Strict source routing; Record route; Timestamp

8. 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
Internet Service Provider
Router(config-if)#no ip proxy-arp

9. What is the ARP Operation value for a Reverse ARP Reply?
Regional Internet Registry
2
4
0.0.0.0/8

10. What is the content of the TCP Window Size field?
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
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
2
Echo

11. What is ICMP Type 3?
Internet Control Message Protocol
Mostly large ISPs - enterprises - or academic institutions
Router#show arp
Destination Unreachable

12. What are the most common IP version numbers?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
LIRs
IPv4 and IPv6
Synchronize

13. What is the the MF-bit in the IPv4 header?
RFC 3330
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Regional Internet Registry
More Fragments follow

14. What are the IP Precedence values?
255.255.255.224
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Protocols that don't include subnet masks in their routing updates
4

15. What is the ARP Operation value for an ARP Reply?
Windowing
Electrical/Optical - Mechanical - Functional and Procedural
Internet Control Message Protocol
2

16. What routing protocols are classful?
RIPv1 and IGRP
8
Reserved (1-bit); DF (1-bit); MF (1-bit)
Open Systems Interconnection

17. What is the IPv4 Protocol number for OSPF?
Host-to-host
Socket
Uniquely identify every application in the network
89

18. Who administers and registers public IP address space and AS numbers within a country or economic unit?
RFC 1918
Mostly large ISPs - enterprises - or academic institutions
URG flag set
NIRs

19. What is URG?
Router Selection
Application
Urgent
255.255.255.192

20. What is the maximum length of an IPv4 header?
Windowing
60 octets
4
Internet Assigned Numbers Authority

21. Who assigns IP address space to its own customers?
LIRs
3
National Internet Registry
17

22. What is the minimum length of an IPv4 header?
Don't Fragment
47
20 octets
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

23. Disables proxy ARP on an interface
Final
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router#show arp
Router(config-if)#no ip proxy-arp

24. What is the Fragment Offset field in the IPv4 header?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
RFC 791
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
0.0.0.0/8

25. Displays the ARP cache of a router
Router#show arp
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
RFC 1918
ICMP Router Discovery Protocol

26. Which IPv4 address range is reserved for self-identification on a local subnet?
RIPv1 and IGRP
6
0.0.0.0/8
Used by a host to obtain the IPv4 address associated with its own MAC address

27. What is the format of an IPv4 header?
Used by a host to obtain the IPv4 address associated with its own MAC address
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
6
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);

28. Who administers and registers IP address space and AS numbers within a region?
Internet Service Provider
Data Offset
RIRs
ICANN and IANA

29. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Final
Acknowledgements - checksums and timers
Per-Hop Behaviour (PHB)
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

30. What is the recommended default TTL?
64
RIRs
Don't Fragment
Echo Reply

31. What is RST?
127.0.0.0/8
255.255.255.128
Reset
Router(config)#ip arp proxy disable

32. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
255.255.255.128
Sequence Number + Data payload octets + 1
Address Resolution Protocol
198.18.0.0/15

33. What is ACK?
Used by a host to obtain the IPv4 address associated with its own MAC address
Acknowledgement
Reserved (1-bit); DF (1-bit); MF (1-bit)
RIRs

34. What is the format of an ICMP header?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router(config)#ip arp proxy disable
255.255.255.248
Internet

35. What are classful routing protocols?

36. What are the protocol categories that describe the physical layer?
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
Electrical/Optical - Mechanical - Functional and Procedural
Internet
0x0800

37. What is the name of the queuing and forwarding of IP packets based on DiffServ?
255.255.255.248
Per-Hop Behaviour (PHB)
Open Systems Interconnection
Windowing

38. What is gratuitous ARP?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Open Systems Interconnection
An ARP request issued by a host with its own IPv4 address as the target address
Reserved (1-bit); DF (1-bit); MF (1-bit)

39. What is FIN?
Urgent
Router#debug arp
Final
Address Resolution Protocol

40. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Internet Protocol
Router#show arp
1
IANA

41. 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
Network interface
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
255.255.255.252

42. What is TCP?
Transmission Control Protocol
4
1
Router(config-if)#no ip proxy-arp

43. What are the uses of gratuitous ARP?
89
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Padding of zeros to ensure that the header ends on a 32-bit boundary
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

44. What is ICMP Type 11?
169.254.0.0/16
Time Exceeded
9
DSCP (6-bit); ECN (2-bit)

45. What is the prerequisite for using the Urgent Pointer field in the TCP header?
2
Router Advertisement
ICMP Router Discovery Protocol
URG flag set

46. What is the format of the Flags field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
IANA
60 octets
255.255.255.128

47. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Acknowledgement
4
Application
Router#show arp

48. What is the most commonly used Option field in the TCP header?
Maximum Segment Size (MSS)
6
0
Router#show arp

49. What is the format of the ToS byte in the IPv4 header?
Redirect
198.18.0.0/15
4
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

50. What is ICANN?
DSCP (6-bit); ECN (2-bit)
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
6
Internet Corporation for Assigned Network Numbers