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FreeBSD Operating System - тест 18

Упражнение 1:
Номер 1
Which network layer is responsible for communication between machines that are not physically connected?

Ответ:

 (1) The Link layer 

 (2) The Network layer 

 (3) The Transport layer 

 (4) The Application layer 


Номер 2
Which network layer is responsible for communication between any two processes, regardless of the machines on which they run?

Ответ:

 (1) The Link layer 

 (2) The Network layer 

 (3) The Transport layer 

 (4) The Application layer 


Номер 3
Which network layer is responsible for the lowest level of communication, between machines that are physically connected?

Ответ:

 (1) The Link layer 

 (2) The Network layer 

 (3) The Transport layer 

 (4) The Application layer 


Упражнение 2:
Номер 1
Which protocol finds Ethernet address of the host, using its IP address?

Ответ:

 (1) IP 

 (2) TCP 

 (3) ARP 

 (4) UDP 


Номер 2
Which protocol sends data out and never cares whether it gets to its destination or not?

Ответ:

 (1) IP 

 (2) TCP 

 (3) ARP 

 (4) UDP 


Номер 3
Which protocol ensures that data gets to its destination, and if it doesn’t, it sends another copy?

Ответ:

 (1) IP 

 (2) TCP 

 (3) ARP 

 (4) UDP 


Упражнение 3:
Номер 1
What is characterized by the rule: the 1 bits of it describe which part of the address is the network part, and the 0 bits describe which part represents hosts on the network?

Ответ:

 (1) IP address 

 (2) Net mask 

 (3) Net address 

 (4) Ethernet address 


Номер 2
Which of address ranges that can be routed in Internet?

Ответ:

 (1) 10.0.0.0/8  

 (2) 172.16.0.0/12 

 (3) 192.168.0.0/16 

 (4) 224.192.0.0/20 


Номер 3
Which of the address classes provides the biggest number of hosts in the network?

Ответ:

 (1)

 (2)

 (3)

 (4)


Упражнение 4:
Номер 1
What is true about Basic Service Set mode of wireless cards interconnection?

Ответ:

 (1) In smaller networks, the cards can interact directly 

 (2) Networks can have multiple base stations which are usually interconnected via a wired Ethernet 

 (3) Wireless cards interoperate with an access point, also called a base station 

 (4) Not standardized mode for cards, supporting a method called Lucent demo ad-hoc mode 


Номер 2
What is true about Extended Basic Service Set mode of wireless cards interconnection?

Ответ:

 (1) In smaller networks, the cards can interact directly 

 (2) Networks can have multiple base stations which are usually interconnected via a wired Ethernet 

 (3) Wireless cards interoperate with an access point, also called a base station 

 (4) Not standardized mode for cards, supporting a method called Lucent demo ad-hoc mode 


Номер 3
What is true about Independent Basic Service Set mode of wireless cards interconnection?

Ответ:

 (1) In smaller networks, the cards can interact directly 

 (2) Networks can have multiple base stations which are usually interconnected via a wired Ethernet 

 (3) Wireless cards interoperate with an access point, also called a base station 

 (4) Not standardized mode for cards, supporting a method called Lucent demo ad-hoc mode 


Упражнение 5:
Номер 1
Find wrong variant of setting the Ethernet interface in the system with several network interfaces.

Ответ:

 (1) # ifconfig inet 223.147.37.5 netmask 255.255.255.0 up 

 (2) # ifconfig dc0 inet 223.147.37.5 netmask 255.255.255.0 

 (3) # ifconfig dc0 223.147.37.5 

 (4) # ifconfig dc0 223.147.37.5/28 


Номер 2
Find wrong variant of setting the Ethernet interface in the system with several network interfaces.

Ответ:

 (1) # ifconfig dc0 inet 223.147.37.5 netmask 255.255.255.0 up 

 (2) # ifconfig dc0 inet 223.147.37.5 netmask 255.255.255.0 

 (3) # ifconfig dc0 223.147.37.5 

 (4) # ifconfig 223.147.37.5 


Номер 3
Find wrong variant of setting the Ethernet interface in the system with several network interfaces.

Ответ:

 (1) # ifconfig dc0 inet 223.147.37.5 netmask 255.255.255.0 up 

 (2) # ifconfig dc0 inet netmask 255.255.255.0 

 (3) # ifconfig dc0 223.147.37.5 

 (4) # ifconfig dc0 223.147.37.5/28 


Упражнение 6:
Номер 1
Which of the following examples sets point-to-point interface?

Ответ:

 (1) # ifconfig lo0 127.0.0.1 

 (2) # ifconfig tun0 139.130.136.133 139.130.136.129 netmask 255.255.255.255 

 (3) # ifconfig dc0 223.147.37.5/28 

 (4) # ifconfig 223.147.37.5/28 


Номер 2
Which of the following examples sets loopback interface?

Ответ:

 (1) # ifconfig lo0 127.0.0.1 

 (2) # ifconfig tun0 139.130.136.133 139.130.136.129 netmask 255.255.255.255 

 (3) # ifconfig dc0 223.147.37.5/28 

 (4) # ifconfig 223.147.37.5/28 


Номер 3
Which of the following examples sets Ethernet interface?

Ответ:

 (1) # ifconfig lo0 127.0.0.1 

 (2) # ifconfig tun0 139.130.136.133 139.130.136.129 netmask 255.255.255.255 

 (3) # ifconfig dc0 223.147.37.5/28 

 (4) # ifconfig 223.147.37.5/28 


Упражнение 7:
Номер 1
Which of the tools can show the routing tables?

Ответ:

 (1) route 

 (2) ifconfig 

 (3) sysctl 

 (4) hostname 


Номер 2
Which of the tools can help user to set the name of the host manually?

Ответ:

 (1) route 

 (2) ifconfig 

 (3) sysctl 

 (4) hostname 


Номер 3
Which of the tools can be used to check the interface configuration.

Ответ:

 (1) route 

 (2) ifconfig 

 (3) sysctl 

 (4) hostname 


Упражнение 8:
Номер 1
Which kind of information can't get a machine automatically from DHCP server?

Ответ:

 (1) IP address 

 (2) Net mask 

 (3) Host domain name 

 (4) Default name servers 


Номер 2
What is false about dhcpd?

Ответ:

 (1) To configure dhcpd, edit the configuration file /usr/local/etc/isc-dhcpd.conf 

 (2) Dhcpd recognizes the network interface, not the machine 

 (3) By default it doesn’t allocate a static IP address 

 (4) DHCP server is included as part of the base system 


Номер 3
What is false about dhcpd?

Ответ:

 (1) The dhcpd port installs a sample startup file in the directory /usr/local/etc/rc.d 

 (2) A sample startup file won’t get executed 

 (3) A sample startup file normally requires configuration 

 (4) When you change the configuration file, you must restart dhcpd 


Упражнение 9:
Номер 1
When a system receives a broadcast data packet, what does it do with it?

Ответ:

 (1) It sends it to all systems to which it has a direct connection 

 (2) It delivers it locally 

 (3) It sends it to one of systems to which it has a direct connection 

 (4) It discards the packet 


Номер 2
When a system receives a data packet and doesn't know what to do with the packet, what does it do with it?

Ответ:

 (1) It sends it to all systems to which it has a direct connection 

 (2) It delivers it locally 

 (3) It sends it to one of systems to which it has a direct connection 

 (4) It discards the packet 


Номер 3
When a system receives a data packet addressed to a system to which it has a direct connection, what does it do with it?

Ответ:

 (1) It sends it to that system 

 (2) It delivers it locally 

 (3) It sends it to the system to which it has a direct connection 

 (4) It discards the packet 


Упражнение 10:
Номер 1
Which of the programs can't be used for adding routes automatically?

Ответ:

 (1) zebra 

 (2) gated 

 (3) route 

 (4) routed 


Номер 2
Which entry in routing table has net mask 0.0.0.0?

Ответ:

 (1) Loopback entry 

 (2) Default entry 

 (3) Local Ethernet entry 

 (4) Broadcast address entry 


Номер 3
Which entry in routing table has net mask 255.255.255.255?

Ответ:

 (1) Loopback entry 

 (2) Default entry 

 (3) Local Ethernet entry 

 (4) Any address entry 


Упражнение 11:
Номер 1
Which way of physical connection forms the backbone of the Internet. They can provide quite high speeds than dialup lines?

Ответ:

 (1) Integrated Systems Digital Network 

 (2) Analogue telephone line connections 

 (3) Leased lines 

 (4) Digital Subscriber Line 


Номер 2
What is the oldest way of physical connection to Internet?

Ответ:

 (1) Integrated Systems Digital Network 

 (2) Analogue telephone line connections 

 (3) Leased lines 

 (4) Digital Subscriber Line 


Номер 3
Which way of physical connection transmits data over normal phone wires, including the use of special modems and has different speeds for the uplink and the downlink?

Ответ:

 (1) Integrated Systems Digital Network 

 (2) Analogue telephone line connections 

 (3) Leased lines 

 (4) Asynchronous Digital Subscriber Line 


Упражнение 12:
Номер 1
Which recommendation of choosing domain name is wrong?

Ответ:

 (1) The name must be available 

 (2) You must be able to specify two name servers for it 

 (3) Apply for a geographical rather than an organizational domain 

 (4) Find a reputable registrar 


Номер 2
Which recommendation of choosing domain name is wrong?

Ответ:

 (1) The name must be available 

 (2) You must be able to specify two name servers for it 

 (3) Apply for an organizational rather than a geographical domain 

 (4) No matter if registrar has a good reputation 


Номер 3
Which recommendation of choosing domain name is wrong?

Ответ:

 (1) The name must be available 

 (2) You must be able to specify one name server for it 

 (3) Apply for an organizational rather than a geographical domain 

 (4) Find a reputable registrar 




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