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Cisco Network Fundamentals - 2

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. Name the private address blocks
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
TCP uses flow control
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

2. IP requires that each sending and receiving device have a __________ IP address.
Unique
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Gateway

3. When the client end of the session has no more data to transfer - it sets the ___________ flag in the header of the segment? (Hint: three-letter acronym)
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
FIN
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer
HTTPS (Secure HTTP)

4. Which of the following are true about network layer encapsulation?
Routers (the subnetting process)
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Gateway

5. Which is a connectionless protocol - UDP or TCP?
It Doesn't - TCP does
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
UDP
It works the same on all Layer 1 media

6. Which of the following are not functions of the network layer?
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer
Unique
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

7. What is the protocol number for UDP?
TCP uses flow control
FIN
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
UDP

8. What is the port range for well known ports
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
UDP - it sends datagrams as 'best effort'
IRC

9. Port 23 is?
Connectionless
Telnet
Routers (the subnetting process)
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use

10. Which of the following is true about IP?

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11. What is the proper order of SYN sequence?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
It works the same on all Layer 1 media
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

12. What is contained in the header of each segment or datagram?
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer
The source and destination port number
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da

13. Encapsulation occurs at all - some or none of the layers of the OSI model?
UDP
IRC
Routing table
All

14. How many bits are in an IPv4 address?
Decapsulation
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
32 - there are four octets of 8 bits each in an IPv4 address

15. Which protocol ensures more reliable delivery between applications - TCP or UDP?
1
Decapsulation
TCP. It makes larger demands on a network
DNS - video-streaming - VoIP

16. How does UDP keep track of sequence numbers?

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17. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Does not
Routing table
Forward the packet to the default route interface (gateway) or just drop/discard the packets

18. Port 443 is?
To track the different conversations crossing the network at the same time
HTTPS (Secure HTTP)
Data link - physical
Destination network - next-hop - metric

19. Pieces of information about a route that a routing table contains
Window size
Connectionless
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
FTP

20. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
128
HTTPS (Secure HTTP)
1

21. What are three key factors to consider when grouping hosts into a common network?
IRC
Upper
Static routing
Purpose - ownership - and geographic location are key ways to divide a network

22. List three network applications that use UDP
DNS - video-streaming - VoIP
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
User Datagram Protocol
Ephermeral

23. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
20 and 8
Upper
TCP
53

24. What does segmentation provide to communications?
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Connectionless
Data link - physical
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

25. Dynamic ports fall into what category of port
Unique
Ephermeral
Window size
Reliable - connection-oriented protocol (resends if not received)

26. Port 8080 is?
SMTP
It means ensuring that each segment that the source sends arrives at the destination
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
An alternate HTTP port

27. What is the port range for Registered ports
It is the most common - and it encapsulates transport layer segments
Synchronize sequence numbers
Forward the packet to the default route interface (gateway) or just drop/discard the packets
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction

28. Which of the following are true about static and dynamic routing?
Upper
Connectionless - Best effort (unreliable) - media independent
Dynamic / private
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

29. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
The source and destination port number
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
An alternate HTTP port
Maximum transmission unit

30. SYN is?
Synchronize sequence numbers
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
Static routing
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer

31. List three network applications that use TCP
49152 - 65535.
20 and 8
It Doesn't - TCP does
Web browsing - email - file transfer

32. What kinds of problems are caused by excessive broadcast traffic on a network segment?
49152 - 65535.
TCP uses flow control
Destination network - next-hop - metric
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

33. Ephermeral port is what type of port
Dynamic / private
Does not
To track the different conversations crossing the network at the same time
RIP (Routing Information Protocol)

34. Why does TCP use a sequence number in the header?
TCP uses flow control
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
Static routing
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

35. Ports can be shared at the same time? (t/f)

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36. What are the transport layer's responsibilities?
All
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
1
Forward the packet to the default route interface (gateway) or just drop/discard the packets

37. MSN messenger uses TCP or UDP?
TCP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
It means ensuring that each segment that the source sends arrives at the destination

38. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Not - these are done by other protocols in other layers
UDP - it sends datagrams as 'best effort'
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
20 and 8

39. On a particular network how would you determine the default gateway address for a host?
1
All
The default gateway address is the address of a router interface that is connected to the same network as the host.
Transport

40. For a network layer packet to travel between hosts - it must be handed down to the _________________ layer - for another layer of encapsulation called framing - and then encoded and put onto the ____________ layer to be sent to the next router.
Data link - physical
Routers (the subnetting process)
Transport
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.

41. What are the three basic characteristics of IPv4?
It Doesn't - TCP does
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
IRC
Connectionless - Best effort (unreliable) - media independent

42. Routers add routes for the connected networks to their ________________ .
It is the most common - and it encapsulates transport layer segments
Routing table
TCP. It makes larger demands on a network
The source and destination port number

43. What is the purpose of the ToS field in the IPv4 header?
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
It Doesn't - TCP does
HTTPS (Secure HTTP)
Acknowledgment field significant

44. What is the purpose of TCP/UDP port numbers?
53
To track the different conversations crossing the network at the same time
Decapsulation
Gateway

45. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Decapsulation
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
Reliable - connection-oriented protocol (resends if not received)
POP3

46. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
Data link - physical
Routers (the subnetting process)

47. The router a network uses to send and receive messages beyond the network is called a ___________ router.
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
Reliable - connection-oriented protocol (resends if not received)
Ephermeral
Gateway

48. Port 520 is?
FTP
RIP (Routing Information Protocol)
Dynamic / private
Unique

49. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
Data link - physical
TCP uses flow control
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
DNS - video-streaming - VoIP

50. Which of the following are true about IP?
TCP
HTTPS (Secure HTTP)
It is the most common - and it encapsulates transport layer segments
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.