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Test your basic knowledge |
IPV4 Addressing
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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 the IPv4 Protocol number for ICMP?
Router(config-if)#no ip proxy-arp
1
255.255.255.192
6
2. What is ICMP Type 3?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Regional Internet Registry
Destination Unreachable
17
3. What is ICMP Type 10?
Router Selection
Padding of zeros to ensure that the header ends on a 32-bit boundary
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
192.88.99.0/24
4. What is the IPv4 Protocol number for EIGRP?
1
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);
88
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
5. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
192.88.99.0/24
Router(config-if)#no ip redirects
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
RFC 3330
6. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Largest segment size that the sender is willing to accept
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Echo Reply
255.255.255.252
7. What is the format of an ICMP header?
ICANN
IPv4 and IPv6
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
RFC 3330
8. What are classful routing protocols?
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183
9. What is the ARP Operation value for a Reverse ARP Request?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
9
3
46
10. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Host-to-host
IANA
Subtract Header Length field from Total Length field
6
11. Which IPv4 address range is reserved for use in documentation and example code?
Don't Fragment
Internet Control Message Protocol
1
192.0.2.0/24
12. What is ARP?
Maximum Segment Size (MSS)
Address Resolution Protocol
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Identifier; Flags and Fragmentation Offset
13. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
169.254.0.0/16
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router(config-if)#arp timeout {seconds}
1
14. What is FIN?
Final
Loose source routing; Strict source routing; Record route; Timestamp
Mostly large ISPs - enterprises - or academic institutions
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
15. What is the DF-bit in the IPv4 header?
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16. What is SYN?
Maximum Segment Size (MSS)
Internet Control Message Protocol
Sequence Numbers
Synchronize
17. What is the function of ICMP router advertisement and router selection messages?
Router(config)#ip arp proxy disable
Used by IRDP on some operating systems to discover local routers
Sequence Number + Data payload octets + 1
4
18. What is the format of a TCP header?
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
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Reset
Per-Hop Behaviour (PHB)
19. Displays the ARP cache of a router
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Router#show arp
Congestion Window Reduced
Data Offset
20. What is added after the option field in the IPv4 header?
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
3
Padding of zeros to ensure that the header ends on a 32-bit boundary
4
21. What is prefix /26 in decimal notation?
Push
Redirect
255.255.255.192
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
22. What IPv4 header fields are used for fragmentation?
Open Systems Interconnection
Maximum Segment Size (MSS)
DSCP (6-bit); ECN (2-bit)
Identifier; Flags and Fragmentation Offset
23. What is IANA?
Length of header in words (32-bit)
Internet Assigned Numbers Authority
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
An ARP request issued by a host with its own IPv4 address as the target address
24. What is the ARP Protocol type value for IPv4?
0x0800
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
192.0.2.0/24
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
25. What are the protocol categories that describe the physical layer?
Electrical/Optical - Mechanical - Functional and Procedural
Both the TCP header and the encapsulated data
Internet Control Message Protocol
Internet
26. What routing protocols are classful?
88
Congestion Window Reduced
6
RIPv1 and IGRP
27. What is the content of the TCP Window Size field?
20 octets
169.254.0.0/16
DSCP (6-bit); ECN (2-bit)
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
28. What is the ARP Operation value for a Reverse ARP Reply?
17
4
Each router decrements the TTL
Both the TCP header and the encapsulated data
29. What is the IPv4 Protocol number of RSVP?
46
Subtract Header Length field from Total Length field
47
Don't Fragment
30. What is the IPv4 protocol number for UDP?
Redirect
17
Acknowledgements - checksums and timers
8
31. Who administers and registers public IP address space and AS numbers within a country or economic unit?
NIRs
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
Each router decrements the TTL
Padding of zeros to ensure that the header ends on a 32-bit boundary
32. Who administers and registers IP address space and AS numbers within a region?
3
RIRs
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
33. What is the IPv4 Protocol number for OSPF?
89
192.88.99.0/24
Internet Protocol
Acknowledgement
34. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Electrical/Optical - Mechanical - Functional and Procedural
Length of header in words (32-bit)
Network interface
Application
35. What is the ARP Operation value for an ARP Request?
255.255.255.240
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Windowing
1
36. What is the most commonly used Option field in the TCP header?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
More Fragments follow
They are the same byte - but the names and value interpretations are different
Maximum Segment Size (MSS)
37. What is CWR?
Sequence Numbers
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Congestion Window Reduced
Time Exceeded
38. What is proxy ARP?
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
60 octets
Transmission Control Protocol
39. What is ISP?
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
Open Systems Interconnection
Internet Service Provider
The next sequence number that the source expects to receive from the destination
40. What is the format of the TCP Header Length field?
47
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Length of header in words (32-bit)
41. Who can assign IP address space to end user organizations?
All Internet Registries
Time to Live
255.255.255.192
20 octets
42. What is URG?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Urgent
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
169.254.0.0/16
43. What are the most common IP version numbers?
RIPv1 and IGRP
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
IPv4 and IPv6
Each router decrements the TTL
44. What is the format of the DiffServ byte?
RFC 1918
20 octets
Time Exceeded
DSCP (6-bit); ECN (2-bit)
45. What is the IPv4 Protocol number for GRE?
47
Router(config)#ip arp proxy disable
255.255.255.248
60 octets
46. Who allocates public IP address ranges to NIRs or LIRs?
Protocols that don't include subnet masks in their routing updates
RIRs
URG flag set
Congestion Window Reduced
47. What are the uses of gratuitous ARP?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
9
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);
6
48. Disables proxy ARP on an interface
Internet Assigned Numbers Authority
Router(config-if)#no ip proxy-arp
Padding of zeros to ensure that the header ends on a 32-bit boundary
Used by IRDP on some operating systems to discover local routers
49. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Router(config-if)#no ip redirects
Internet
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
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);
50. What is the ARP Operation value for an ARP Reply?
Router(config-if)#no ip proxy-arp
Router Selection
2
Loose source routing; Strict source routing; Record route; Timestamp
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