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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
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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 ARP Operation value for an ARP Reply?
2
Sequence Numbers
Mostly large ISPs - enterprises - or academic institutions
The next sequence number that the source expects to receive from the destination

2. What is the IPv4 Protocol number for EIGRP?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Local Internet Registry
Mostly large ISPs - enterprises - or academic institutions
88

3. Which RFC defines IPv4?
Urgent
Internet Control Message Protocol
RFC 791
255.255.255.240

4. Who group public IPv4 address space by major geographic region?
60 octets
ICANN and IANA
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);
Sequence Number + Data payload octets + 1

5. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
Internet Corporation for Assigned Network Numbers
Router Selection
2

6. What is ICANN?
2
An ARP request issued by a host with its own IPv4 address as the target address
Internet Corporation for Assigned Network Numbers
Network interface

7. What are the most common IP version numbers?
IPv4 and IPv6
ICANN and IANA
LIRs
255.255.255.252

8. What is the ARP Hardware type value for Ethernet?
RIPv1 and IGRP
Destination Unreachable
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
1

9. Disables the sending of ICMP redirect messages
Data Offset
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
IPv4 and IPv6
Router(config-if)#no ip redirects

10. What is FIN?
Echo
4
More Fragments follow
Final

11. Which IPv4 address range is reserved for self-identification on a local subnet?
0.0.0.0/8
20 octets
An ARP request issued by a host with its own IPv4 address as the target address
8

12. What are classful routing protocols?

13. What is the difference between the ToS and the DiffServ byte?
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
Data Offset
They are the same byte - but the names and value interpretations are different

14. Deletes dynamic entries from the ARP cache
Internet Service Provider
Each router decrements the TTL
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Uniquely identify every application in the network

15. What is proxy ARP?
Internet Service Provider
URG flag set
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
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

16. What is the value of the TCP Reserved field?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router(config-if)#no ip redirects
RIPv1 and IGRP
0

17. What is ICMP Type 10?
Echo Reply
4
Router Selection
ECN-Echo

18. What are the IP Precedence values?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Echo Reply
Used by IRDP on some operating systems to discover local routers
2

19. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Loose source routing; Strict source routing; Record route; Timestamp
Sequence Number
ECN-Echo
Internet Protocol

20. What is OSI?
National Internet Registry
Open Systems Interconnection
Network interface
They are the same byte - but the names and value interpretations are different

21. What is PSH?
Windowing
Largest segment size that the sender is willing to accept
Push
2

22. What is the the MF-bit in the IPv4 header?
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
Host-to-host
More Fragments follow
255.255.255.128

23. 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
Router Advertisement
Synchronize
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

24. Displays the ARP cache of a router
Router#show arp
Regional Internet Registry
Acknowledgement
1

25. What is the IPv4 Protocol number for ICMP?
RIRs
1
4
255.255.255.252

26. What is the format of an ICMP header?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Regional Internet Registry
Windowing
Redirect

27. Disables proxy ARP on an interface
Router(config-if)#no ip proxy-arp
255.255.255.128
NIRs
64

28. What is a TCP port number of an application called when it is coupled with the IP address of the server?
RFC 791
Socket
255.255.255.248
255.255.255.252

29. What is the ARP Operation value for a Reverse ARP Reply?
4
Protocols that include subnet masks in their routing updates
Congestion Window Reduced
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

30. What is ISP?
Network interface
RIRs
RFC 791
Internet Service Provider

31. What is the format of an ARP packet?
Open Systems Interconnection
Router#clear arp-cache [{interface {interface}} | {ip-address}]
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
RFC 1918

32. Which IPv4 address range is reserved for loopback testing?
RFC 1918
127.0.0.0/8
National Internet Registry
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

33. What is the ARP Protocol address length value for IPv4?
4
National Internet Registry
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
RFC 3330

34. What is CWR?
Congestion Window Reduced
6
Redirect
Protocols that include subnet masks in their routing updates

35. What is Reverse ARP?
Echo
255.255.255.192
169.254.0.0/16
Used by a host to obtain the IPv4 address associated with its own MAC address

36. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
1
Windowing
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
NIRs

37. What is SYN?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Synchronize
169.254.0.0/16
88

38. What is a TCP Acknowledgement Number?
Time Exceeded
1
The next sequence number that the source expects to receive from the destination
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

39. What is ECE?
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
255.255.255.240
ECN-Echo
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

40. What is prefix /30 in decimal notation?
The next sequence number that the source expects to receive from the destination
Router(config-if)#no ip redirects
255.255.255.252
255.255.255.248

41. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Synchronize
64
Host-to-host
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

42. What is the Fragment Offset field in the IPv4 header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Subtract Header Length field from Total Length field
RFC 1918
255.255.255.192

43. What is Inverse ARP?

44. What is the format of the Flags field in the TCP 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)
ICANN
Regional Internet Registry
Router(config-if)#no ip proxy-arp

45. What is prefix /26 in decimal notation?
255.255.255.192
127.0.0.0/8
17
Sequence Number

46. What is added after the option field in the IPv4 header?
192.0.2.0/24
255.255.255.128
Padding of zeros to ensure that the header ends on a 32-bit boundary
Internet Protocol

47. Who are LIRs?
2
URG flag set
Mostly large ISPs - enterprises - or academic institutions
17

48. What is RIR?
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);
89
Regional Internet Registry

49. What is the format of the ToS byte in the IPv4 header?
Windowing
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Regional Internet Registry
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

50. What is added after the Option field in the TCP header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
9
National Internet Registry
60 octets