Test your basic knowledge |

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?
89
9
Final
255.255.255.240

2. What is the recommended default TTL?
4
64
Router(config)#arp {ip-address} {mac-address} arpa
Router#clear arp-cache [{interface {interface}} | {ip-address}]

3. What mechanisms are used by TCP to provide reliable segment delivery?
Internet Protocol
Acknowledgements - checksums and timers
DSCP (6-bit); ECN (2-bit)
More Fragments follow

4. What is the format of the Flags field in the IPv4 header?
Per-Hop Behaviour (PHB)
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Reset
Reserved (1-bit); DF (1-bit); MF (1-bit)

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

6. What IPv4 header fields are used for fragmentation?
Acknowledgement
RIRs
Identifier; Flags and Fragmentation Offset
Router#debug arp

7. What is the difference between the ToS and the DiffServ byte?
1
Router#debug arp
They are the same byte - but the names and value interpretations are different
Router(config)#ip arp proxy disable

8. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Sequence Number
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Synchronize

9. Which IPv4 address range is reserved for self-identification on a local subnet?
RFC 3330
Redirect
0.0.0.0/8
Reset

10. Who administers and registers IP address space and AS numbers within a region?
National Internet Registry
Final
1
RIRs

11. What is the IPv4 Protocol number for OSPF?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Echo
Time to Live
89

12. What is the maximum length of an IPv4 header?
89
60 octets
1
Uniquely identify every application in the network

13. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Congestion Window Reduced
Network interface
255.255.255.248
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

14. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Used by IRDP on some operating systems to discover local routers
ICANN
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Router#debug arp

15. What is the most commonly used Option field in the TCP header?
Internet Assigned Numbers Authority
Don't Fragment
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Maximum Segment Size (MSS)

16. What is the first octet rule for IPv4 address classes in decimal?
4
6
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

17. What is the the MF-bit in the IPv4 header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
3
Sequence Number + Data payload octets + 1
More Fragments follow

18. What is the format of the DiffServ byte?
Padding of zeros to ensure that the header ends on a 32-bit boundary
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
DSCP (6-bit); ECN (2-bit)
192.0.2.0/24

19. What is the ARP Operation value for an ARP Request?
Per-Hop Behaviour (PHB)
4
Router(config-if)#no ip proxy-arp
1

20. What is the ARP Protocol type value for IPv4?
0x0800
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
4
Router Advertisement

21. What is the minimum length of an IPv4 header?
DHCP
Sequence Number
Internet
20 octets

22. Disables proxy ARP on all interfaces
Router(config)#ip arp proxy disable
Internet Corporation for Assigned Network Numbers
National Internet Registry
Sequence Numbers

23. What is the format of the ToS byte in the IPv4 header?
IANA
4
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Router#show arp

24. Which IPv4 address range is reserved for loopback testing?
127.0.0.0/8
255.255.255.252
255.255.255.240
Push

25. What is ICMP Type 0?
Echo Reply
Subtract Header Length field from Total Length field
9
20 octets

26. What is LIR?
Router Selection
Local Internet Registry
RIRs
RIPv1 and IGRP

27. 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
Redirect
IANA
Uniquely identify every application in the network

28. What are the steps to subnet an IPv4 address?
Router(config-if)#no ip proxy-arp
9
Redirect
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. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
0.0.0.0/8
255.255.255.224
Router(config-if)#arp timeout {seconds}
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

30. Who group public IPv4 address space by major geographic region?
Per-Hop Behaviour (PHB)
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
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);
ICANN and IANA

31. What is ICMP Type 11?
Time Exceeded
RFC 1918
NIRs
Acknowledgements - checksums and timers

32. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
Both the TCP header and the encapsulated data
Local Internet Registry
169.254.0.0/16
ICANN

33. What is the IPv4 Protocol number for IP in IP encapsulation?
Internet Assigned Numbers Authority
88
0x0800
4

34. What is the format of an IPv4 header?
ICANN
Padding of zeros to ensure that the header ends on a 32-bit boundary
Used by a host to obtain the IPv4 address associated with its own MAC address
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);

35. What is ECE?
ECN-Echo
Both the TCP header and the encapsulated data
Local Internet Registry
64

36. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
198.18.0.0/15
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
Host-to-host
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

37. What is PSH?
Loose source routing; Strict source routing; Record route; Timestamp
Push
Uniquely identify every application in the network
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

38. What is prefix /29 in decimal notation?
National Internet Registry
Transmission Control Protocol
Used by a host to obtain the IPv4 address associated with its own MAC address
255.255.255.248

39. What is ARP?
Each router decrements the TTL
Host-to-host
47
Address Resolution Protocol

40. Disables proxy ARP on an interface
Router(config-if)#no ip proxy-arp
Length of header in words (32-bit)
Windowing
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

41. What is the function of ICMP router advertisement and router selection messages?
1
Used by IRDP on some operating systems to discover local routers
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
The next sequence number that the source expects to receive from the destination

42. Who assigns IP address space to its own customers?
Subtract Header Length field from Total Length field
LIRs
RFC 3330
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

43. What is prefix /28 in decimal notation?
255.255.255.240
URG flag set
Internet Protocol
Acknowledgements - checksums and timers

44. What is RST?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Reset
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Time to Live

45. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Sequence Number + Data payload octets + 1
Padding of zeros to ensure that the header ends on a 32-bit boundary
Congestion Window Reduced

46. What is a TCP Acknowledgement Number?
The next sequence number that the source expects to receive from the destination
Used by IRDP on some operating systems to discover local routers
64
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

47. What is the IPv4 Protocol number for GRE?
Mostly large ISPs - enterprises - or academic institutions
47
0.0.0.0/8
1

48. What is ACK?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
2
Acknowledgement
1

49. Disables the sending of ICMP redirect messages
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
ICMP Router Discovery Protocol
Router(config-if)#no ip redirects
Regional Internet Registry

50. What is RIR?
169.254.0.0/16
Sequence Numbers
Mostly large ISPs - enterprises - or academic institutions
Regional Internet Registry