On which layers of the OSI model does a transceiver work? (Choose one):
On which layers of the OSI model does a hub work? (Choose one):
Which physical topology is used in the presence of a hub? (Choose one):
On which layers of the OSI model does the switch work? (Choose two):
Which physical topology is used in the presence of a switch? (Choose one):
Which parameters are stored in the switching table of a switch? (Choose three):
Source MAC address of a frame
Destination MAC address of a frame
Type of frame
Frame Check Sequence FCS
Age of entry
A switch has learned where a computer with a given MAC address is connected to, but looses this information later. What is the most probable reason of this behavior?
An administrator has deleted the entry
Flooding of a frame has deleted the entry
The connected computer has deleted the entry
Timer of switching table aged out
The destination MAC address of an errornous frame deleted the entry
What will the switch do in the MAC-table in the case of question 8? (Choose one):
Deleting entry for port Fa1
Inserting Destination MAC-address
Deleting entry for port Fa9
Restart the timer for port Fa1
Inserting source MAC-Adress
Restarting timer for port Fa9
What will the switch do in the MAC-table in the case of question 9 (auf dem bild steht 10 aber es ist das richtige Bild)? (Choose one):
Inserting Source MAC-address
Restarting the timer for port Fa9
Which organization is responsible for the global administration of network numbers of an
IP address? (Choose one):
Local network administrator
CIA / NSA
Which facts hold for private IPv4 addresses? (Choose 3):
It does not access the physical network
It can be applied to isolated hosts which are not directly accessible from the global internet.
There are 3 IPv4 address ranges defined for private IP addresses.
10.255.255.255 is a possible private IP network address.
192.168.1.12 is a possible private IP host address.
172.16.1.258 is a possible private IP host address.
22.214.171.124 is a possible private IP host address.
Which of the following IPv4 host adresses are globally routable? Assume default subnet
masks according to the network class. (Choose 3)
What is the dotted decimal representation of the following IPv4 address given in binary
format (Chose one) 10100001.00111010.10101100.00001110
Consider a classful IPv4 address with 16 bits network portion and 16 bits host portion. What statements hold for this type of address. (Choose four answers):
Class A address
Class B address
A possible network address is 126.96.36.199 .
A possible network address is 188.8.131.52 .
A possible network address is 184.108.40.206 .
Each network may have up to 255 hosts.
Each network may have up to 65 534 hosts.
The default subnet mask is 255.0.0.0 .
The default subnet mask is 255.255.0.0 .
The default subnet mask is 255.255.255.0 .
What is the range of valid IP addresses that can be assigned to hosts in the IP network with the network number 212.126.53 and default network mask. (Choose for 2)
First host address = 220.127.116.11
First host address = 18.104.22.168
First host address = 22.214.171.124
Last host address = 126.96.36.199
Last host address = 188.8.131.52
Last host address = 184.108.40.2066
How can reflection in a copper cable be avoided (choose one):
Impedance of attached network components must be equal to the impedance of the cable
Impedance of attached network components must be higher as the impedance of the cable
Impedance of attached network components must be smaller as the impedance of the cable
What are types of noise (choose two):
Far-end thermal noise
How can thermal noise be decreased (choose one):
Cooling of components
How can EMI reduced in a copper cable (choose two):
Cancellation of electromagnetic fields
Cancellation of static electric fields
Which layers of the OSI-model are standardized by the IEEE (choose all that apply):
Which are fields of an Ethernet frame (choose three):
Time to live TTL
Source IP address
Destination MAC address
Which are fields of an IEEE 802.3-frame (choose three):
Start of Frame Delimiter
Destination IP address
Source MAC address
Choose all network layer protocols you know:
Which protocols belong to the application layer? Click all that apply:
Which layers in the OSI- and TCP/IP model are identical in their functionality
Which functionality belongs to TCP (choose three):
Error detection only
Which functionality belongs to UDP (choose three):
SIP is used for (choose two):
Call establishment for IP-telephony
Signaling for IP-video
Which layer describes end-to-end-delivery of segments (choose one):
Which layer describes the delivery of frames (choose one):
Which are protocols of the Data Link Layer (choose three):
Which term describes Gnutella best?
Offline text-based communication service
Hierarchical file-sharing service
Peer-to-peer file-sharing service
Real-time text-based communications service
Tool for sending and receiving electronic mails
Tool for groups of people to edit and view web-pages together
Retrieval service for HTML-pages
Which term describes Wiki best?
Real-time text-based communication service
Which term describes Instant Messaging best?
Tool for groups of peoples to edit and view web-pages together
What describes SMB respectively SAMBA best?
Short-term file-sharing tool in a client-server architecture
Tool for chatting
Long-term file-sharing tool in a peer-to-peer architecture
Tool for weblog
Long-term file-sharing tool in a client-server architecture
Short-term file-sharing tool in a peer-to-peer architecture
What is the disadvantage of a connection-less network?
Sender does not know if receiver is operable
Messages cannot get lost without notification of receiver
What are features of the internet (choose three):
It requires a connection oriented network for all applications
Data packets can travel multiple paths through the network
It allows for billing of network by the amount of time a connection is established
It can rapidly adapt to the loss of data transmission facilities
It efficiently utilizes the network infrastructure to transfer data
What are the features of peer-to-peer networks (choose two)?
Only a small server is needed
Clients run a dedicated server software
High bit-rates are possible
No management procedures are necessary
Each machine is client and server
Which devices are network devices (choose all that apply):
Which media technologies in communication networks do you know (choose three)?
Calculate the number of possible connections between 8 nodes in a full mesh network:
Calculate the number of possible connections between 6 nodes in a full mesh network:
Calculate the decimal value of the binary number 10101011(binary):
Calculate the binary number of decimal 158dec:
Calculate the hex value of the following 12 bits: 1011 1001 1110:
Calculate the decimal value of the hexadecimal number: 11Ahex: