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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. Displays the ARP cache of a router
They are the same byte - but the names and value interpretations are different
4
Maximum Segment Size (MSS)
Router#show arp

2. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
2
RFC 3330
Internet

3. What is NIR?
National Internet Registry
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
9
Urgent

4. What are the uses of gratuitous ARP?
NIRs
4
Windowing
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

5. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
89
IANA
Internet

6. What is Inverse ARP?

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7. What is ARP?
Final
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
IANA
Address Resolution Protocol

8. What is ICANN?
46
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
127.0.0.0/8

9. What is FIN?
Address Resolution Protocol
255.255.255.252
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Final

10. What is ICMP Type 0?
Internet Protocol
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
Echo Reply
Internet Service Provider

11. Which IPv4 address range is reserved for self-identification on a local subnet?
0.0.0.0/8
Largest segment size that the sender is willing to accept
Mostly large ISPs - enterprises - or academic institutions
192.0.2.0/24

12. What is the IPv4 Protocol number for ICMP?
Padding of zeros to ensure that the header ends on a 32-bit boundary
0
1
Urgent

13. What is the IPv4 Protocol number of RSVP?
46
Per-Hop Behaviour (PHB)
Local Internet Registry
Echo Reply

14. What is the purpose of a socket?
Socket
4
Uniquely identify every application in the network
Synchronize

15. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
2
255.255.255.252
IANA
Used by a host to obtain the IPv4 address associated with its own MAC address

16. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Router(config)#ip arp proxy disable
Congestion Window Reduced
Application
The next sequence number that the source expects to receive from the destination

17. What is the name of the queuing and forwarding of IP packets based on DiffServ?
88
Per-Hop Behaviour (PHB)
Padding of zeros to ensure that the header ends on a 32-bit boundary
6

18. What is the format of a UDP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
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);
0.0.0.0/8
0

19. Which protocol has mostly replaced Reverse ARP?
Synchronize
DHCP
17
192.0.2.0/24

20. Which RFC defines the private IPv4 address ranges?
RFC 1918
An ARP request issued by a host with its own IPv4 address as the target address
RIPv1 and IGRP
Protocols that don't include subnet masks in their routing updates

21. Who group public IPv4 address space by major geographic region?
6
ICANN and IANA
Time Exceeded
Loose source routing; Strict source routing; Record route; Timestamp

22. What is the IPv4 Protocol number for OSPF?
Push
89
Sequence Number
17

23. What is the the MF-bit in the IPv4 header?
89
More Fragments follow
Router#clear arp-cache [{interface {interface}} | {ip-address}]
255.255.255.128

24. What is a TCP Acknowledgement Number?
Acknowledgement
The next sequence number that the source expects to receive from the destination
Sequence Number
6

25. What mechanisms are used by TCP to provide reliable segment delivery?
An ARP request issued by a host with its own IPv4 address as the target address
Acknowledgements - checksums and timers
Don't Fragment
DSCP (6-bit); ECN (2-bit)

26. What routing protocols are classful?
Used by a host to obtain the IP address associated with another host's MAC address
RIPv1 and IGRP
Host-to-host
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

27. What is the content of the TCP Window Size field?
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
Padding of zeros to ensure that the header ends on a 32-bit boundary
1
Router(config-if)#arp timeout {seconds}

28. What is the ARP Hardware address length value for Ethernet?
6
Socket
Synchronize
0x0800

29. What is prefix /29 in decimal notation?
64
Router(config)#ip arp proxy disable
Destination Unreachable
255.255.255.248

30. What are the private IPv4 address ranges?
Mostly large ISPs - enterprises - or academic institutions
Destination Unreachable
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

31. What is the IPv4 Protocol number for TCP?
They are the same byte - but the names and value interpretations are different
Internet
Router Selection
6

32. What is a TCP port number of an application called when it is coupled with the IP address of the server?
0
IANA
Router(config-if)#no ip redirects
Socket

33. What is the ARP Operation value for a Reverse ARP Request?
All Internet Registries
3
192.0.2.0/24
Used by a host to obtain the IPv4 address associated with its own MAC address

34. What is the minimum length of an IPv4 header?
Internet Corporation for Assigned Network Numbers
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
20 octets
4

35. What is the recommended default TTL?
Acknowledgements - checksums and timers
Each router decrements the TTL
0.0.0.0/8
64

36. What is added after the option field in the IPv4 header?
Router(config)#arp {ip-address} {mac-address} arpa
Padding of zeros to ensure that the header ends on a 32-bit boundary
64
6

37. What are classless routing protocols?
4
Protocols that include subnet masks in their routing updates
Local Internet Registry
Echo

38. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Protocols that include subnet masks in their routing updates
Router(config-if)#arp timeout {seconds}
Loose source routing; Strict source routing; Record route; Timestamp
Used by a host to obtain the IP address associated with another host's MAC address

39. Disables the sending of ICMP redirect messages
Padding of zeros to ensure that the header ends on a 32-bit boundary
47
Router(config-if)#no ip redirects
All Internet Registries

40. What is the ARP Protocol type value for IPv4?
2
0x0800
255.255.255.224
169.254.0.0/16

41. Enables debugging output for ARP transactions
Router#debug arp
2
Don't Fragment
Identifier; Flags and Fragmentation Offset

42. What is the IPv4 Protocol number for GRE?
Used by a host to obtain the IPv4 address associated with its own MAC address
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
Router(config-if)#no ip redirects
47

43. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Router Selection
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Final
IANA

44. What is the IPv4 protocol number for UDP?
Regional Internet Registry
All Internet Registries
ECN-Echo
17

45. Disables proxy ARP on an interface
Acknowledgements - checksums and timers
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Router(config-if)#no ip proxy-arp
Urgent

46. What is proxy ARP?
Acknowledgements - checksums and timers
1
Address Resolution 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

47. What is the prerequisite for using the Urgent Pointer field in the TCP header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Socket
RIRs
URG flag set

48. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Length of header in words (32-bit)
ICANN
88
Socket

49. What is the format of a TCP header?
Per-Hop Behaviour (PHB)
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
Address Resolution Protocol
89

50. What is the TTL field in the IPv4 header?
Router(config)#arp {ip-address} {mac-address} arpa
Address Resolution Protocol
Router(config-if)#no ip proxy-arp
Time to Live