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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 PSH?
Router Selection
Push
Sequence Numbers
ICMP Router Discovery Protocol

2. What is added after the option field in the IPv4 header?
Router(config)#arp {ip-address} {mac-address} arpa
Push
National Internet Registry
Padding of zeros to ensure that the header ends on a 32-bit boundary

3. What is the IPv4 Protocol number for ICMP?
169.254.0.0/16
192.0.2.0/24
1
Used by a host to obtain the IPv4 address associated with its own MAC address

4. What is the function of ICMP router advertisement and router selection messages?
4
Time Exceeded
Used by IRDP on some operating systems to discover local routers
Application

5. What is TCP?
88
They are the same byte - but the names and value interpretations are different
Transmission Control Protocol
Redirect

6. Disables proxy ARP on all interfaces
Internet Service Provider
Windowing
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
Router(config)#ip arp proxy disable

7. What is ACK?
LIRs
RFC 3330
Acknowledgement
6

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

9. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Socket
ICMP Router Discovery Protocol
Mostly large ISPs - enterprises - or academic institutions
Router(config-if)#arp timeout {seconds}

10. What is RIR?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
NIRs
Regional Internet Registry
Host-to-host

11. What is the ARP Hardware address length value for Ethernet?
6
2
88
Router(config-if)#arp timeout {seconds}

12. 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
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
88

13. Who allocates public IP address ranges to NIRs or LIRs?
National Internet Registry
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
RIRs

14. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Network interface
0.0.0.0/8
Electrical/Optical - Mechanical - Functional and Procedural

15. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Congestion Window Reduced
Router(config-if)#no ip proxy-arp
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);
Socket

16. What is the ARP Operation value for an ARP Request?
Internet
Mostly large ISPs - enterprises - or academic institutions
ICANN and IANA
1

17. What is the format of the DiffServ byte?
ICMP Router Discovery Protocol
IANA
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
DSCP (6-bit); ECN (2-bit)

18. What is the difference between the ToS and the DiffServ byte?
They are the same byte - but the names and value interpretations are different
IANA
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
47

19. What is FIN?
ECN-Echo
Loose source routing; Strict source routing; Record route; Timestamp
Router(config-if)#no ip proxy-arp
Final

20. What is ICMP Type 9?
Router Selection
Router Advertisement
Mostly large ISPs - enterprises - or academic institutions
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

21. What is ICMP Type 5?
Redirect
More Fragments follow
Destination Unreachable
89

22. What is the format of a UDP 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);
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Router(config-if)#no ip redirects
National Internet Registry

23. What is the IPv4 Protocol number for EIGRP?
Identifier; Flags and Fragmentation Offset
Internet Service Provider
8
88

24. What is the IPv4 Protocol number for TCP?
Used by a host to obtain the IPv4 address associated with its own MAC address
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Reserved (1-bit); DF (1-bit); MF (1-bit)
6

25. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
6
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
47

26. What is a TCP Acknowledgement Number?
Router(config-if)#arp timeout {seconds}
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
Echo Reply

27. What is the ARP Operation value for an Inverse ARP Reply?
0x0800
255.255.255.192
Echo Reply
9

28. What routing protocols are classful?
Don't Fragment
RIPv1 and IGRP
ECN-Echo
NIRs

29. What is the first octet rule for IPv4 address classes in decimal?
Uniquely identify every application in the network
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
ICANN and IANA

30. Which IPv4 address range is reserved for self-identification on a local subnet?
192.0.2.0/24
0.0.0.0/8
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Used by a host to obtain the IP address associated with another host's MAC address

31. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Urgent
Per-Hop Behaviour (PHB)
National Internet Registry
Router(config-if)#arp timeout {seconds}

32. Disables the sending of ICMP redirect messages
Router(config-if)#no ip redirects
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
4
Data Offset

33. What is the IPv4 Protocol number for OSPF?
89
Router(config-if)#arp timeout {seconds}
Router#show arp
Router#debug arp

34. What is prefix /30 in decimal notation?
255.255.255.252
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
ECN-Echo
Router Selection

35. What is ISP?
ICANN and IANA
255.255.255.240
Application
Internet Service Provider

36. What is the most commonly used Option field in the TCP header?
Maximum Segment Size (MSS)
169.254.0.0/16
127.0.0.0/8
Destination Unreachable

37. What are the most common IP version numbers?
Mostly large ISPs - enterprises - or academic institutions
IPv4 and IPv6
Used by IRDP on some operating systems to discover local routers
Time Exceeded

38. What is ARP?
ECN-Echo
Address Resolution Protocol
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Length of header in words (32-bit)

39. 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
169.254.0.0/16
RFC 3330
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

40. What is OSI?
Mostly large ISPs - enterprises - or academic institutions
Open Systems Interconnection
Destination Unreachable
Internet Assigned Numbers Authority

41. What is the the MF-bit in the IPv4 header?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
169.254.0.0/16
Echo Reply
More Fragments follow

42. Disables proxy ARP on an interface
4
The next sequence number that the source expects to receive from the destination
Application
Router(config-if)#no ip proxy-arp

43. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
20 octets
ICANN
Transmission Control Protocol
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 IP?
2
Network interface
Internet Protocol
National Internet Registry

45. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
URG flag set
RFC 3330
Sequence Number
6

46. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
IPv4 and IPv6
Internet
Echo Reply

47. What is gratuitous ARP?
255.255.255.248
An ARP request issued by a host with its own IPv4 address as the target address
Don't Fragment
46

48. What is ICMP Type 8?
Redirect
Echo
The next sequence number that the source expects to receive from the destination
RFC 3330

49. Who allocates IP address space and AS numbers to RIRs?
Per-Hop Behaviour (PHB)
1
IANA
Protocols that include subnet masks in their routing updates

50. Who group public IPv4 address space by major geographic region?
Used by a host to obtain the IP address associated with another host's MAC address
Protocols that don't include subnet masks in their routing updates
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
ICANN and IANA