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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 FIN?
Transmission Control Protocol
National Internet Registry
Final
Router Advertisement

2. What are the most common IP version numbers?
IPv4 and IPv6
Open Systems Interconnection
RFC 1918
LIRs

3. What is RIR?
LIRs
Data Offset
Padding of zeros to ensure that the header ends on a 32-bit boundary
Regional Internet Registry

4. What is NIR?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Internet Control Message Protocol
Internet Service Provider
National Internet Registry

5. What is IP?
8
192.88.99.0/24
Protocols that include subnet masks in their routing updates
Internet Protocol

6. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Network interface
255.255.255.128
DHCP

7. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Open Systems Interconnection
127.0.0.0/8

8. Which IPv4 address range is reserved for loopback testing?
Protocols that don't include subnet masks in their routing updates
Protocols that include subnet masks in their routing updates
4
127.0.0.0/8

9. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
IANA
RIRs
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);
Reserved (1-bit); DF (1-bit); MF (1-bit)

10. What is the first octet rule for IPv4 address classes in binary?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
NIRs
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Internet Protocol

11. What is CWR?
255.255.255.224
Congestion Window Reduced
Application
Router(config)#arp {ip-address} {mac-address} arpa

12. What is LIR?
169.254.0.0/16
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
More Fragments follow
Local Internet Registry

13. What is the purpose of a socket?
9
Sequence Number
Congestion Window Reduced
Uniquely identify every application in the network

14. What is the recommended default TTL?
DSCP (6-bit); ECN (2-bit)
RIRs
255.255.255.240
64

15. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
IANA
Socket
The next sequence number that the source expects to receive from the destination

16. What is ARP?
DSCP (6-bit); ECN (2-bit)
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Echo
Address Resolution Protocol

17. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Sequence Number
Windowing
255.255.255.240

18. What is the content of the TCP Window Size field?
Urgent
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
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
Time to Live

19. What is the value of the TCP Reserved field?
Both the TCP header and the encapsulated data
Regional Internet Registry
0
Router Advertisement

20. What is Inverse ARP?

21. Specifies the format in which subnet masks are displayed in show command output
Internet Protocol
255.255.255.248
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
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

22. 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);
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Largest segment size that the sender is willing to accept
Echo Reply

23. What are classful routing protocols?

24. What is the format of the ToS byte in the IPv4 header?
Each router decrements the TTL
Internet Assigned Numbers Authority
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

25. What is URG?
198.18.0.0/15
Don't Fragment
Urgent
Host-to-host

26. What is ICMP Type 8?
89
IANA
Echo
Urgent

27. What mechanisms are used by TCP to provide reliable segment delivery?
255.255.255.192
Acknowledgements - checksums and timers
Internet Assigned Numbers Authority
Router#show arp

28. What is the the MF-bit in the IPv4 header?
More Fragments follow
2
6
Echo Reply

29. What are the IP Precedence values?
255.255.255.248
4
Congestion Window Reduced
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

30. What is the function of ICMP router advertisement and router selection messages?
DSCP (6-bit); ECN (2-bit)
National Internet Registry
Used by IRDP on some operating systems to discover local routers
Push

31. What is ACK?
Sequence Number
Identifier; Flags and Fragmentation Offset
Router#debug arp
Acknowledgement

32. What is prefix /26 in decimal notation?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Internet Assigned Numbers Authority
255.255.255.192
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

33. What is the IPv4 Protocol number for ICMP?
20 octets
1
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
Internet Corporation for Assigned Network Numbers

34. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
Internet Control Message Protocol
Reset
DSCP (6-bit); ECN (2-bit)

35. Disables the sending of ICMP redirect messages
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
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);
Router(config-if)#arp timeout {seconds}
Router(config-if)#no ip redirects

36. What is TCP?
The next sequence number that the source expects to receive from the destination
Data Offset
88
Transmission Control Protocol

37. 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
64
They are the same byte - but the names and value interpretations are different
0x0800

38. What is the IPv4 Protocol number for EIGRP?
Time Exceeded
IANA
Mostly large ISPs - enterprises - or academic institutions
88

39. What is added after the Option field in the TCP header?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
6
Padding of zeros to ensure that the header ends on a 32-bit boundary
More Fragments follow

40. What is ICMP?
Internet Control Message Protocol
Open Systems Interconnection
Push
Per-Hop Behaviour (PHB)

41. What is ISP?
Sequence Numbers
NIRs
Identifier; Flags and Fragmentation Offset
Internet Service Provider

42. What is ICANN?
Data Offset
Internet Corporation for Assigned Network Numbers
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

43. What is the ARP Hardware type value for Ethernet?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Per-Hop Behaviour (PHB)
1
Reset

44. What are classless routing protocols?
Data Offset
Protocols that include subnet masks in their routing updates
IANA
Internet

45. What is the IPv4 Protocol number for OSPF?
Length of header in words (32-bit)
Router#show arp
89
NIRs

46. Enables debugging output for ARP transactions
47
Data Offset
127.0.0.0/8
Router#debug arp

47. What is Reverse ARP?
Used by a host to obtain the IPv4 address associated with its own MAC address
RFC 3330
Final
88

48. What is the content of the the Urgent Pointer field in the TCP header?
Electrical/Optical - Mechanical - Functional and Procedural
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
URG flag set
6

49. What is the format of a UDP header?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
RFC 3330
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

50. What is the most commonly used Option field in the TCP header?
ICANN and IANA
Maximum Segment Size (MSS)
Final
Uniquely identify every application in the network