102-500 - Topic 5

Which of the following may occur as a consequence of using the command ifconfig? (Choose THREE correct answers.). New name servers may be added to the resolver configuration. Network interfaces may become active or inactive. The routing table may change. IP addresses may change. The system's host name may change.

Which of the following details is NOT provided in any output from the netstat utility?. broadcast services. interface statistics. masquerading connections. network connections. routing tables.

Given the following routing table: How would an outgoing packet to the destination 192.168.2.150 be handled?. It would be passed to the default router 192.168.178.1 on wlan0. It would be directly transmitted on the device eth0. It would be passed to the default router 255.255.255.0 on eth0. It would be directly transmitted on the device wlan0. It would be passed to the router 192.168.1.1 on eth0.

Which command, depending on its options, can display the open network connections, the routing tables, as well as network interface statistics. (Specify ONLY the command without any path or parameters.).

What is true regarding a default route?. The default route is always used first. When the default route is not available more specific routes are tried. When a default route is set, all other routes are disabled until the default route is deleted. The default route is only used if there is not a more specific route to a destination host or network. Without a default route, no network communication even in directly attached networks is possible.

How many IP-addresses can be used for unique hosts inside the IPv4 subnet 192.168.2.128/28? (Specify the number only without any additional information.).

What is the command to delete the default gateway from the system IP routing table? (Choose TWO correct answers.). route del default. ifconfig unset default. netstat -r default. ip route del default. sysctl ipv4.default_gw=0.

Which of the following tools used for DNS debugging, reports not only the response from the name server but also details about the query?. dnsq. dig. hostname. dnslookup. zoneinfo.

Which of the following is a valid IPv6 address?. 2001:db8:3241::1. 2001::db8:4581::1. 2001:db8:0g41::1. 2001%db8%9990%%1. 2001.db8.819f..1.

Which of the following keywords can be used in the file /etc/resolv. conf? (Choose TWO correct answers.). substitute. nameserver. search. lookup. method.

Which of the following is true about IPv6?. With IPv6, the TCP port numbers of most services have changed. IPv6 no longer supports broadcast addresses. IPv4 addresses can be used without any change with IPv6. IPv6 no longer supports multicast addresses. For IPv6, UDP and TCP have been replaced by the Rapid Transmission Protocol RTP.

Which parameter must be passed to ifconfig to activate a previously inactive network interface? (Specify the parameter only without any command, path or additional options).

What is the lowest numbered unprivileged TCP port? (Specify the number in digits only.).

Which command is used to set the hostname of the local system? (Specify ONLY the command without any path or parameters.).

On a regular users workstation the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?. The local routing information may be corrupted and must be re-validated using a routing protocol. One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-D) to wait for a timeout. There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default. DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.

Which of the following keywords can be used in the file /etc/nsswitch. conf to specify a source for host name lookups? (Choose TWO correct answers.). resolv. dns. remote. files. hosts.

Which of the following IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose THREE correct answers.). 127.0.0.0/8. 10.0.0.0/8. 169.255.0.0/16. 172.16.0.0/12. 192.168.0.0/16.

Which keyword must be listed in the hosts option of the Name Service Switch configuration file in order to make host lookups consult the /etc/hosts file?.

Which of the following commands will help identify a broken router between the local and the remote machine?. ps. netstat. nslookup. ifconfig. traceroute.

Which of the following programs can be used to determine the routing path to a given destination?. dig. netstat. ping. route. traceroute.

Which of the following lines are valid in the file /etc/hosts? (Choose TWO correct answers.). 2001:db8::15 www.example.com www. www.example.com www 203.0.13.15. 203.0.113.15 www.example.com www. www.example.com,www 203.0.13.15,2001:db8::15. 2003.0.113.15,2001:db8::15 www.example.com www.

What of the following can be done by the command ifconfig? (Choose TWO correct answers.). Set a network interface active or inactive. Specify the kernel module to be used with a network interface. Allow regular users to change the network configuration of a network interface. Change the netmask used on a network interface. Specify which network services are available on a network interface.

Which of the following commands can be used to display the local routing table? (Choose TWO correct answers.). ifconfig. dig. netstat. route. trackroute.

Which of the following statements is valid in the file /etc/nsswitch. conf?. multi on. 192.168.168.4 dns-server. hosts: files dns. include /etc/nsswitch.d/.

What is the purpose of the nsswitch.conf file?. It is used to configure where the C library looks for system information such as host names and user passwords. It is used to configure network protocol port numbers such as for HTTP or SMTP. It is used to configure LDAP authentication services for the local system. It is used to configure which network services will be turned on during the next system boot.

With IPv6, how many bits have been used for the interface identifier of an unicast address? (Specify the number using digits only.).

What is true regarding TCP port 23?. Port 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used. Port 23 is the well known port for the SSH service which provides secure logins. Port 23 is the well known port for the rlogin service which is SSL secured by default. Port 23 is the well known port for the system login services which are encrypted when the user runs the starttls command in his login shell.

Which port is the default server port for the HTTPS protocol? (Specify the port number using digits.).