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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. Routers add routes for the connected networks to their ________________ .
User Datagram Protocol
Routing table
False. It's like a file - only one process can read/write.
FTP

2. What four tasks does the network layer perform?
User Datagram Protocol
POP3
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
128

3. Port 8080 is?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
It is the most common - and it encapsulates transport layer segments
Synchronize sequence numbers
An alternate HTTP port

4. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
It is the most common - and it encapsulates transport layer segments
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
TCP

5. Port 23 is?
Telnet
UDP
Purpose - ownership - and geographic location are key ways to divide a network
FIN

6. What is the port range for well known ports
128
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Routing table
DNS - video-streaming - VoIP

7. TCP is a ________________ layer protocol.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Transport
32 - there are four octets of 8 bits each in an IPv4 address

8. Which of the following are true about network layer encapsulation?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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.
HTTPS (Secure HTTP)
UDP

9. 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?
TCP uses flow control
Routing table
Purpose - ownership - and geographic location are key ways to divide a network
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

10. What is the purpose of TCP/UDP port numbers?
Destination network - next-hop - metric
To track the different conversations crossing the network at the same time
Static routing
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.

11. Port 520 is?
It works the same on all Layer 1 media
RIP (Routing Information Protocol)
Web browsing - email - file transfer
Synchronize sequence numbers

12. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Maximum transmission unit
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

13. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Upper

14. On a particular network how would you determine the default gateway address for a host?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
The default gateway address is the address of a router interface that is connected to the same network as the host.
UDP
Routing table

15. Port 25 is?
It means ensuring that each segment that the source sends arrives at the destination
SMTP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
UDP

16. What is the port range for Registered ports
32 - there are four octets of 8 bits each in an IPv4 address
FIN
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
Synchronize sequence numbers

17. ACK is?
Netstat -r and route print
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
Acknowledgment field significant
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

18. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Destination network - next-hop - metric
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Decapsulation
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

19. What is the port range for dynamic or private ports
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
UDP - it sends datagrams as 'best effort'
49152 - 65535.

20. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Connectionless - Best effort (unreliable) - media independent
SMTP

21. Which is a connectionless protocol - UDP or TCP?
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
53
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

22. SYN is?
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
Packet
TCP uses flow control
Synchronize sequence numbers

23. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Routing table
Dynamic / private
All
Reliable - connection-oriented protocol (resends if not received)

24. Port 69 is?
TCP
TFTP - Trivial File Transfer Protocol
Connectionless - Best effort (unreliable) - media independent
UDP

25. Are well known ports registered
It Doesn't - TCP does
The source and destination port number
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Routers (the subnetting process)

26. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
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
Packet
49152 - 65535.
Transport

27. MSN messenger uses TCP or UDP?
TCP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
UDP - it sends datagrams as 'best effort'
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

28. Which protocol ensures more reliable delivery between applications - TCP or UDP?
UDP
TCP. It makes larger demands on a network
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
53

29. MTU stands for ?
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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
Maximum transmission unit

30. What are the three basic characteristics of IPv4?
Synchronize sequence numbers
TCP
Upper
Connectionless - Best effort (unreliable) - media independent

31. The three main features of routes in a routing table are?
Telnet
Destination network - next-hop - metric
An alternate HTTP port
DNS - video-streaming - VoIP

32. What are the transport layer's responsibilities?
An alternate HTTP port
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
20 and 8
Window size

33. Why is IP 'media independent'?
User Datagram Protocol
It works the same on all Layer 1 media
RIP (Routing Information Protocol)
Telnet

34. The three-way handshake performs what three functions?
HTTPS (Secure HTTP)
False. It's like a file - only one process can read/write.
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

35. What kinds of problems are caused by excessive broadcast traffic on a network segment?
RIP (Routing Information Protocol)
TCP. It makes larger demands on a network
TCP
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

36. Routes to remote networks with the associated next-hops can be manually configured on the router. What is the same for this type of routing?
Does not
Static routing
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
An alternate HTTP port

37. How many bits are in an IPv4 address?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
FTP
DNS - video-streaming - VoIP
32 - there are four octets of 8 bits each in an IPv4 address

38. Port 20 is?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
TCP
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
FTP

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

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40. UDP stands for?
User Datagram Protocol
Packet
It means ensuring that each segment that the source sends arrives at the destination
Purpose - ownership - and geographic location are key ways to divide a network

41. List three network applications that use TCP
Web browsing - email - file transfer
FTP
DNS - video-streaming - VoIP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

42. What is a broadcast domain?
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
TCP
Packet
It Doesn't - TCP does

43. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
HTTPS (Secure HTTP)
The default gateway address is the address of a router interface that is connected to the same network as the host.
TCP uses flow control

44. Port 443 is?
HTTPS (Secure HTTP)
TFTP - Trivial File Transfer Protocol
POP3
IRC

45. Which of the following are not functions of the network layer?
It works the same on all Layer 1 media
TCP
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
UDP

46. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
SMTP
Connectionless
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Acknowledgment and reassembly (receipt of packets and putting them in right order)

47. Which of the following are true about TCP and IP?

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48. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Not - these are done by other protocols in other layers
Upper
TFTP - Trivial File Transfer Protocol

49. What is the purpose of the ToS field in the IPv4 header?
Purpose - ownership - and geographic location are key ways to divide a network
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.
Does not
Telnet

50. What two commands can be used to view a host's routing table?
Window size
Routing table
Web browsing - email - file transfer
Netstat -r and route print