ITI

The OpenLDAP Software 2.4 Administrator's Guide contains the following sentence: "The chain overlay provides basic chaining capability to the underlying database." Given an LDAP client C and two LDAP servers A and B, so, what is supported by OpenLDAP?

Consider the following LDAP Directory Information Tree (DIT) that shows RDNs, the base DN, and the root DSE.

Is this a valid DIT?

Consider the object classes that have to be specified when setting up an entry in LDAP:

Is it possible to set up an entry by only specifying a single ABSTRACT object class (and proper attributes, but without any other object class)?

Consider the object classes that have to be specified when setting up an entry in LDAP:

To set up an entry, one STRUCTURAL object class has already been chosen. Which kind of object class may be chosen in addition to gain access to further attributes?

What is achieved by the Name Service Switch (NSS) in GNU/Linux systems?

Which of the following terms denotes the standard user authentication framework in GNU/Linux?

To add entries to the LDAP DIT you have to provide a text file according to which standard?

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the address resolution protocol (ARP):

Prior to sending the IP packet, PC0 has to find out one missing address via ARP. Which address is missing?

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the address resolution protocol (ARP):

What is the layer 2 destination address of the ARP-Request which is sent by PC0?

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the address resolution protocol (ARP):

Now, PC0 sends the IP packet to PC1 by handing it over to Router0. Which layer 3 destination address is used in this case?

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the address resolution protocol (ARP):

Router0 has recieved the IP packet. Prior to sending it to PC1, Router0 has to find out one missing address via ARP. Which address is missing?

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the address resolution protocol (ARP):

In the last step, Router0 sends the IP packet to PC1. Which layer 2 source address is used in this case?

An IPv4 packet of total length 3276 bytes and with no header options is to be transmitted over a link with a MTU of 1320 bytes. For this, the IPv4 packet has to be fragmented.

How many fragments are needed?

An IPv4 packet of total length 3276 bytes and with no header options is to be transmitted over a link with a MTU of 1320 bytes. For this, the IPv4 packet has to be fragmented.

What is the total size (in bytes) of the first fragment?

An IPv4 packet of total length 3276 bytes and with no header options is to be transmitted over a link with a MTU of 1320 bytes. For this, the IPv4 packet has to be fragmented

What is the total size (in bytes) of the last fragment?

An IPv4 packet of total length 3276 bytes and with no header options is to be transmitted over a link with a MTU of 1320 bytes. For this, the IPv4 packet has to be fragmented.

What is value of the Fragment Offset header field in the last fragment?

IMAGE IS MISSING - take a look at 9. SAT

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the neighbor discovery (ND) protocol. The routing tables of all devices are correctly configured, and the router is contacted via the shown IPv6 addresses only (i.e., not via link-local addresses).

Prior to sending the IP packet, PC0 has to find out one missing address via ND. Which address is missing?

IMAGE IS MISSING - take a look at 9. SAT

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the neighbor discovery (ND) protocol. The routing tables of all devices are correctly configured, and the router is contacted via the shown IPv6 addresses only (i.e., not via link-local addresses).

What is the layer 3 destination address of the Neighbor Solicitation ICMP packet which is sent by PC0?

IMAGE IS MISSING - take a look at 9. SAT

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the neighbor discovery (ND) protocol. The routing tables of all devices are correctly configured, and the router is contacted via the shown IPv6 addresses only (i.e., not via link-local addresses).

Now, PC0 sends the IP packet to PC1 by handing it over to Router0. Which layer 3 destination address is used in this case?

IMAGE IS MISSING - take a look at 9. SAT

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the neighbor discovery (ND) protocol. The routing tables of all devices are correctly configured, and the router is contacted via the shown IPv6 addresses only (i.e., not via link-local addresses).

Router0 has recieved the IP packet. Prior to sending it to PC1, Router0 has to find out one missing address via ND. Which address is missing?

IMAGE IS MISSING - take a look at 9. SAT

For the following network structure, we consider the transmission of an IP packet from PC0 to PC1 together with the usage of the neighbor discovery (ND) protocol. The routing tables of all devices are correctly configured, and the router is contacted via the shown IPv6 addresses only (i.e., not via link-local addresses).

In the last step, Router0 sends the IP packet to PC1. Which layer 3 source address is used in this case?

A router receives an IP packet where the header contains TTL=1. What will the router do with this IP packet? (IPv4)

A router has to fragment an IP packet for further transmission. The IP header contains the flags MF=0 and DF=1. What will the router do with this IP packet? (IPv4)

What is the purpose of the Identification field in the IP header? (IPv4)

Consider the following set of DNS records:

www.site1.tld. 86400 IN A 106.244.0.1 
www.site2.tld. 86400 IN A 106.244.0.1 
www.site3.tld. 86400 IN A 106.244.0.1

Which conclusion(s) could be drawn?

A single Apache web server installation shall be used to serve 99 different web sites via IPv4 on the well-known port 80.

How many IPv4 addresses are at least required when using name-based virtual hosts only?

A single Apache web server installation shall be used to serve 99 different web sites via IPv4 on the well-known port 80.

How many IPv4 addresses are at least required when using IP-based virtual hosts only?

Consider an Apache web server installation where two virtual hosts are defined:

<VirtualHost *:80> 
  ServerAdmin webmaster@site1.tld 
  ServerName www.site1.tld 
  DocumentRoot /var/www/x 
  <Directory /var/www/x> 
    Options -Indexes 
    Require ip 199.232.0.0/18 
    Require ip 199.232.128.0/17 
  </Directory> 
</VirtualHost>

-------------------------------------------------------------------------------

<VirtualHost *:80> 
  ServerAdmin webmaster@site2.tld 
  ServerName www.site2.tld 
  DocumentRoot /var/www/y 
  <Directory /var/www/y> 
    Options -Indexes 
    <RequireAll> 
      Require all granted 
      Require not ip 199.234.0.0/15 
    </RequireAll> 
  </Directory> 
</VirtualHost>

where everything (Apache, DNS, network) is configured correctly such that these virtual hosts are reachable. The Apache directive DirectoryIndex is left at its default value and the following files exist below the directory /var/www:

/var/www/x/file1 
/var/www/x/index.html 
/var/www/y/file1

What is returned to the client PC with IP address 199.232.0.1 for the request URL: http://www.site1.tld/

Consider an Apache web server installation where two virtual hosts are defined:

<VirtualHost *:80> 
  ServerAdmin webmaster@site1.tld 
  ServerName www.site1.tld 
  DocumentRoot /var/www/x 
  <Directory /var/www/x> 
    Options -Indexes 
    Require ip 199.232.0.0/18 
    Require ip 199.232.128.0/17 
  </Directory> 
</VirtualHost>

-------------------------------------------------------------------------------

<VirtualHost *:80> 
  ServerAdmin webmaster@site2.tld 
  ServerName www.site2.tld 
  DocumentRoot /var/www/y 
  <Directory /var/www/y> 
    Options -Indexes 
    <RequireAll> 
      Require all granted 
      Require not ip 199.234.0.0/15 
    </RequireAll> 
  </Directory> 
</VirtualHost>

where everything (Apache, DNS, network) is configured correctly such that these virtual hosts are reachable. The Apache directive DirectoryIndex is left at its default value and the following files exist below the directory /var/www:

/var/www/x/file1 
/var/www/x/index.html 
/var/www/y/file1

What is returned to the client PC with IP address 199.232.0.1 for the request URL: http://www.site1.tld/

Consider an Apache web server installation where two virtual hosts are defined:

<VirtualHost *:80> 
  ServerAdmin webmaster@site1.tld 
  ServerName www.site1.tld 
  DocumentRoot /var/www/x 
  <Directory /var/www/x> 
    Options -Indexes 
    Require ip 199.232.0.0/18 
    Require ip 199.232.128.0/17 
  </Directory> 
</VirtualHost>

-------------------------------------------------------------------------------

<VirtualHost *:80> 
  ServerAdmin webmaster@site2.tld 
  ServerName www.site2.tld 
  DocumentRoot /var/www/y 
  <Directory /var/www/y> 
    Options -Indexes 
    <RequireAll> 
      Require all granted 
      Require not ip 199.234.0.0/15 
    </RequireAll> 
  </Directory> 
</VirtualHost>

where everything (Apache, DNS, network) is configured correctly such that these virtual hosts are reachable. The Apache directive DirectoryIndex is left at its default value and the following files exist below the directory /var/www:

/var/www/x/file1 
/var/www/x/index.html 
/var/www/y/file1

What is returned to the client PC with IP address 199.232.64.1 for the request URL: http://www.site2.tld/

Consider an Apache web server installation where two virtual hosts are defined:

<VirtualHost *:80> 
  ServerAdmin webmaster@site1.tld 
  ServerName www.site1.tld 
  DocumentRoot /var/www/x 
  <Directory /var/www/x> 
    Options -Indexes 
    Require ip 199.232.0.0/18 
    Require ip 199.232.128.0/17 
  </Directory> 
</VirtualHost>

-------------------------------------------------------------------------------

<VirtualHost *:80> 
  ServerAdmin webmaster@site2.tld 
  ServerName www.site2.tld 
  DocumentRoot /var/www/y 
  <Directory /var/www/y> 
    Options -Indexes 
    <RequireAll> 
      Require all granted 
      Require not ip 199.234.0.0/15 
    </RequireAll> 
  </Directory> 
</VirtualHost>

where everything (Apache, DNS, network) is configured correctly such that these virtual hosts are reachable. The Apache directive DirectoryIndex is left at its default value and the following files exist below the directory /var/www:

/var/www/x/file1 
/var/www/x/index.html 
/var/www/y/file1

What is returned to the client PC with IP address 199.234.0.1 for the request URL: http://www.site2.tld/file1

Working with the bash, the current directory contains 5 files:

   f12   f65   f66179   f9   f96581

How many files are listed for each of the following commands?

ls  ?[5][4]*?

Working with the bash, the current directory contains 5 files:

   f12   f65   f66179   f9   f96581

How many files are listed for each of the following commands?

ls  *[7491]

You enter the following command at the shell prompt and get the resulting output:

seq 84 186 | head -$a | tail -$b 
148

Given the output of the command above, what is the value of the shell variable a?

You enter the following command at the shell prompt and get the resulting output:

seq 84 186 | head -$a | tail -$b 
148

Given the output of the command above, what is the value of the shell variable b?

Working with the bash, the shell variable v has been set to 173 (i.e., v=173). What is the output of the following commands?

echo  "\\$v"

Working with the bash, the shell variable v has been set to 173 (i.e., v=173). What is the output of the following commands?

echo  "'$v'"

The IP address configuration of a network interface is given by: 121.206.139.252/19

Determine the corresponding NETWORK address.

The IP address configuration of a network interface is given by: 121.206.139.252/19

Determine the corresponding BROADCAST address.