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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 a TCP port number of an application called when it is coupled with the IP address of the server?
Router#debug arp
Socket
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
RIRs

2. What is the IPv4 Protocol number of RSVP?
46
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Echo Reply
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

3. What is the other name for the TCP Header Length field?
Router(config-if)#arp timeout {seconds}
Router Selection
255.255.255.128
Data Offset

4. 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
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Identifier; Flags and Fragmentation Offset

5. What is the IPv4 Protocol number for ICMP?
Local Internet Registry
192.0.2.0/24
Acknowledgement
1

6. What is ICANN?
Internet Corporation for Assigned Network Numbers
The next sequence number that the source expects to receive from the destination
Echo
Padding of zeros to ensure that the header ends on a 32-bit boundary

7. What is the ARP Protocol type value for IPv4?
192.88.99.0/24
Application
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
0x0800

8. What are the uses of gratuitous ARP?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
47
255.255.255.252

9. What is ICMP Type 0?
4
Echo Reply
Router(config)#arp {ip-address} {mac-address} arpa
0x0800

10. What are the steps to subnet an IPv4 address?
Socket
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
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
Windowing

11. What is the ARP Operation value for a Reverse ARP Request?
3
198.18.0.0/15
Router#clear arp-cache [{interface {interface}} | {ip-address}]
ICMP Router Discovery Protocol

12. What is IANA?
Sequence Number
64
Internet Assigned Numbers Authority
Internet Corporation for Assigned Network Numbers

13. What is the ARP Protocol address length value for IPv4?
Synchronize
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Each router decrements the TTL
4

14. What are classful routing protocols?

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15. What is a TCP Acknowledgement Number?
The next sequence number that the source expects to receive from the destination
IANA
Used by IRDP on some operating systems to discover local routers
LIRs

16. What is the function of ICMP router advertisement and router selection messages?
Time to Live
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Used by IRDP on some operating systems to discover local routers
1

17. What is IRDP?
ICMP Router Discovery Protocol
Used by IRDP on some operating systems to discover local routers
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
Regional Internet Registry

18. What are classless routing protocols?
NIRs
Protocols that include subnet masks in their routing updates
RFC 791
Socket

19. What is the ARP Operation value for an Inverse ARP Reply?
9
IANA
An ARP request issued by a host with its own IPv4 address as the target address
National Internet Registry

20. What is the format of an ARP packet?
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
IANA
Application
All Internet Registries

21. Which protocol has mostly replaced Reverse ARP?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
ECN-Echo
1
DHCP

22. What is the IPv4 Protocol number for GRE?
Host-to-host
Used by a host to obtain the IPv4 address associated with its own MAC address
Protocols that include subnet masks in their routing updates
47

23. What is the recommended default TTL?
6
127.0.0.0/8
64
8

24. What is the format of the DiffServ byte?
47
Redirect
192.0.2.0/24
DSCP (6-bit); ECN (2-bit)

25. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
20 octets
Destination Unreachable
IANA
Each router decrements the TTL

26. What is the ARP Operation value for an ARP Request?
Congestion Window Reduced
1
Socket
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

27. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
DSCP (6-bit); ECN (2-bit)
Sequence Numbers
Internet Assigned Numbers Authority
Sequence Number + Data payload octets + 1

28. What is NIR?
National Internet Registry
Local Internet Registry
47
ICANN

29. Who administers and registers IP address space and AS numbers within a region?
1
Padding of zeros to ensure that the header ends on a 32-bit boundary
RIRs
Router(config)#arp {ip-address} {mac-address} arpa

30. What is ICMP Type 3?
255.255.255.252
169.254.0.0/16
Destination Unreachable
Echo

31. Who assigns IP address space to its own customers?
LIRs
Protocols that include subnet masks in their routing updates
IANA
Synchronize

32. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
All Internet Registries
Both the TCP header and the encapsulated data
Internet
Sequence Number + Data payload octets + 1

33. What is URG?
169.254.0.0/16
Urgent
255.255.255.248
Internet

34. What is the ARP Operation value for an Inverse ARP Request?
6
Protocols that don't include subnet masks in their routing updates
8
Identifier; Flags and Fragmentation Offset

35. What is the format of the Flags field in the IPv4 header?
The next sequence number that the source expects to receive from the destination
Reserved (1-bit); DF (1-bit); MF (1-bit)
All Internet Registries
Redirect

36. Which IPv4 address range is reserved for use in documentation and example code?
192.0.2.0/24
Network interface
ECN-Echo
8

37. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Host-to-host
Padding of zeros to ensure that the header ends on a 32-bit boundary
0.0.0.0/8

38. Specifies the format in which subnet masks are displayed in show command output
RFC 3330
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Router(config-if)#no ip redirects
IANA

39. What is the first octet rule for IPv4 address classes in decimal?
RFC 3330
255.255.255.240
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Internet Protocol

40. What is the TTL field in the IPv4 header?
Time to Live
URG flag set
1
Internet Service Provider

41. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Reserved (1-bit); DF (1-bit); MF (1-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
Sequence Number
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

42. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
255.255.255.224
192.88.99.0/24
255.255.255.248
Internet Assigned Numbers Authority

43. Disables proxy ARP on all interfaces
1
Time Exceeded
Acknowledgements - checksums and timers
Router(config)#ip arp proxy disable

44. 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
An ARP request issued by a host with its own IPv4 address as the target address
Time Exceeded
6

45. What is the ARP Hardware address length value for Ethernet?
6
Network interface
255.255.255.128
Regional Internet Registry

46. What routing protocols are classful?
Echo Reply
8
1
RIPv1 and IGRP

47. What is Reverse ARP?
Congestion Window Reduced
Internet Control Message Protocol
URG flag set
Used by a host to obtain the IPv4 address associated with its own MAC address

48. What is prefix /27 in decimal notation?
Used by IRDP on some operating systems to discover local routers
255.255.255.224
Acknowledgement
Host-to-host

49. What is the difference between the ToS and the DiffServ byte?
Sequence Numbers
Used by IRDP on some operating systems to discover local routers
Largest segment size that the sender is willing to accept
They are the same byte - but the names and value interpretations are different

50. What is added after the option field in the IPv4 header?
0.0.0.0/8
Subtract Header Length field from Total Length field
Padding of zeros to ensure that the header ends on a 32-bit boundary
Acknowledgements - checksums and timers