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Linux+ 104 > Networking Fundamentals > Flashcards

Networking Fundamentals Flashcards

1
Q 
How many bits make up an IPv6 address?
A. 32
B. 48
C. 64
D. 128
E. 256
A

128

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2
Q

Which command is used to manually assign an IP address to a network interface? (Specify ONLY
the command without any path or parameters.)

A

ifconfig, /sbin/ifconfig, ip, /sbin/ip

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3
Q 
Which of the following files is consulted when programs like netstat try to match port numbers to
names?
A. /etc/networks
B. /etc/portmapper
C. /etc/protocols
D. /etc/resolv.conf
E. /etc/services
A

/etc/services

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4
Q 
Which of the following statements is valid in the file /etc/resolv.conf?
A. order hosts,bind
B. 192.168.168.4 dns-server
C. hosts: files,dns
D. domain example.com
A

domain example.com

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5
Q

Which of the following is a correct entry in the /etc/hosts file?
A. localhost 127.0.0.1 localhost.localdomain
B. localhost.localdomain localhost 127.0.0.1
C. localhost localhost.localdomain 127.0.0.1
D. 127.0.0.1 localhost.localdomain localhost
E. localhost.localdomain 127.0.0.1 localhost

A

D. 127.0.0.1 localhost.localdomain localhost

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6
Q

What is the assigned port number for the HTTP service? (Specify the port number using digits.)

A

80

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7
Q

What is the purpose of the dig command?
A. It can be used as a tool for querying DNS servers.
B. It can be used for searching through indexed file content.
C. It can be used to look for open ports on a system.
D. It can be used to ping all known hosts on the current subnet.

A

It can be used as a tool for querying DNS servers.

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8
Q

Given the following line from /etc/nsswitch.conf:
hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
By default, which file will be queried first for hostname lookups? (Specify the full name of the file,
including path.)

A

/etc/hosts

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9
Q

When issuing the command ifconfig eth0 192.168.1.20/24 up, which of the following happens?
(Choose TWO correct answers.)
A. The address 192.168.1.20 is associated with the interface eth0.
B. A network route to 192.168.1.0 with the netmask 255.255.255.0 pointing directly to eth0 is
created.
C. 192.168.1.1 is probed for router functionality and, in case of success, it is added to the list of
default routers.
D. The addresses from 192.168.1.20 to 192.168.1.24 are activated on the interface eth0.
E. If eth0 was configured with a previous IP address, it is retained in addition to adding the new
address.

A

A. The address 192.168.1.20 is associated with the interface eth0.
B. A network route to 192.168.1.0 with the netmask 255.255.255.0 pointing directly to eth0 is
created.

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10
Q

What is the name of the file that defines the sources (like DNS or local configuration files) and the order in which they are consulted when resolving hostnames? (Specify the full name of the file, including path.)

A

/etc/nsswitch.conf

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11
Q

Given the following routing table
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.178.0 0.0.0.0 255.255.255.0 U 9 0 0 wlan0
Why does the command route add default gw 192.168.1.1 fail?
A. Because there is no route to 192.168.1.1.
B. Because only one route can exist at a time.
C. Because there is already a default route.
D. Because default routes can not be set manually.
E. Because default routes must be set with ifconfig.

A

Because there is no route to 192.168.1.1.

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12
Q

In order to discover the link layer address of the device that owns a specific IPv4 or IPv6 address, which mechanism is used?
A. Both IPv4 and IPv6 use ARP.
B. Both IPv4 and IPv6 use Neighbor Discovery.
C. IPv4 uses ARP while IPv6 uses Neighbor Discovery.
D. IPv4 uses Neighbor Discovery while IPv6 uses ARP.
E. Both IPv4 and IPv6 can use either ARP or Neighbor Discovery depending on the network.

A

IPv4 uses ARP while IPv6 uses Neighbor Discovery.

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13
Q 
Which of the following are valid IPv4 network masks? (Choose TWO correct answers.)
A. 255.255.0.0
B. 255.255.255.65
C. 255.255.0.255
D. 0.0.0.1
E. 255.255.255.248
A
  1. 255.0.0

255. 255.255.248

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14
Q

How does the ping command work by default?
A. It sends a UDP packet to port 0 of the remote host and waits to receive a UDP error response
in return.
B. It sends an ARP request to a remote host and waits to receive an ARP response in return.
C. It sends a TCP SYN packet to a remote host and waits to receive an TCP ACK response in
return.
D. It sends a broadcast packet to all hosts on the net and waits to receive, among others, a
response from the target system.
E. It sends an ICMP Echo Request to a remote host and waits to receive an ICMP Echo Response
in return.

A

E. It sends an ICMP Echo Request to a remote host and waits to receive an ICMP Echo Response
in return.

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15
Q

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.)

A

14

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16
Q

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

A

1024

17
Q 
Which of the following statements is valid in the file /etc/nsswitch.conf?
A. multi on
B. 192.168.168.4 dns-server
C. hosts: files dns
D. include /etc/nsswitch.d/
A

hosts: files dns

18
Q

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.)

A

netstat, /bin/netstat, ss, /usr/bin/ss

19
Q

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

A

443

20
Q

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

A

B. 10.0.0.0/8
D. 172.16.0.0/12
E. 192.168.0.0/16

21
Q 
Which of the following tools used for DNS debugging, reports not only the response from the name server but also details about the query?
A. dnsq
B. dig
C. hostname
D. dnslookup
E. zoneinfo
A

dig

22
Q 
What of the following can be done by the command ifconfig? (Choose TWO correct answers.)
A. Set a network interface active or inactive.
B. Specify the kernel module to be used with a network interface.
C. Allow regular users to change the network configuration of a network interface.
D. Change the netmask used on a network interface.
E. Specify which network services are available on a network interface
A

Set a network interface active or inactive.

Change the netmask used on a network interface.

23
Q 
Which of the following programs can be used to determine the routing path to a given destination?
A. dig
B. netstat
C. ping
D. route
E. traceroute
A

E. traceroute

24
Q

Given the following routing table:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.178.1 0.0.0.0 UG 0 0 0 wlan0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.2.0 192.168.1.1 255.255.255.0 U 0 0 0 eth0
192.168.178.0 0.0.0.0 255.255.255.0 U 9 0 0 wlan0 How would an outgoing packet to the destination 192.168.2.150 be handled?

A. It would be passed to the default router 192.168.178.1 on wlan0.
B. It would be directly transmitted on the device eth0.
C. It would be passed to the default router 255.255.255.0 on eth0.
D. It would be directly transmitted on the device wlan0.
E. It would be passed to the router 192.168.1.1 on eth0.

A

It would be passed to the router 192.168.1.1 on eth0.

25
Q 
Which of the following is a valid IPv6 address?
A. 2001:db8:3241::1
B. 2001::db8:4581::1
C. 2001:db8:0g41::1
D. 2001%db8%9990%%1
E. 2001.db8.819f..1
A

2001:db8:3241::1

26
Q 
Which of the following keywords can be used in the file /etc/resolv.conf? (Choose TWO correct
answers.)
A. substitute
B. nameserver
C. search
D. lookup
E. method
A

B. nameserver

C. search

27
Q 
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?
A. The local routing information may be corrupted and must be re-validated using a routing
protocol.
B. 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.
C. 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.
D. DNS resolution may not be working as route by default tries to resolve names of routers and
destinations and may run into a timeout.
A

DNS resolution may not be working as route by default tries to resolve names of routers and
destinations and may run into a timeout.

28
Q

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?

A

files

Linux+ 104 (6 decks)

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