Basics of IP Addressing and the OSI Model

 

#cybersecurity #coursera #quiz #solution #network 

1.

Question 1

How would you express 15 in binary (base 2)?

1 / 1 point

01010

10000

01001

01111

Correct

Correct!

2.

Question 2

How many octets are used to define the network portion of the IP address in a Class A network?

0 / 1 point

1

0

3

2

Incorrect

Incorrect.

3.

Question 3

The device used to separate the network portion of an IP address from the host portion is called what?

1 / 1 point

The address filter.

The subnet mask.

The network separation filter.

The host mask.

Correct

Correct!

4.

Question 4

The IP header contains a time-to-live (TTL) value. How is this value expressed?

1 / 1 point

The number of delivery attempts that may be made before the packet is returned to the source address as undeliverable.

The number of Layer 3 devices (hubs, routers, etc.) the packet is allowed to pass through before it is dropped.

The number of minutes a packet may live if it is not delivered.

The number of seconds a packet may live if not delivered.

Correct

Correct!

5.

Question 5

Which is the host portion of this IP address 192.168.52.3/24?

1 / 1 point

192.168.52

168.52.3

3

24

Correct

Correct!

6.

Question 6

Which network mask belongs to a Class C network?

1 / 1 point

255.0.0.0

255.255.255.0

255.255.255.255

0.0.0.0

Correct

Correct!

7.

Question 7

Which IPv4 addressing schema would you use to send a message to all systems on the network?

1 / 1 point

Simulcast

Broadcast

Multicast

Unicast

Correct

Correct!

8.

Question 8

Which three (3) of the following are legitimate IPv6 addressing schemas?

1 / 1 point

Broadcast

Multicast

Correct

Partially correct!

Anycast

Correct

Partially correct!

Unicast

Correct

Partially correct!

9.

Question 9

True or False: Utilities such as TFTP, DNS and SNMP utilize the TCP transport protocol.

1 / 1 point

True

False

Correct

Correct!

10.

Question 10

Which two (2) of these fields are included in a UDP header?

1 / 1 point

Destination Port

Correct

Partially correct!

Destination IP Address

Source Port

Correct

Partially correct!

Source IP Address

11.

Question 11

Which four (4) of these are characteristic of the TCP transport protocol?

1 / 1 point

Unreliable

Ordered data; duplicate detection

Correct

Partially correct!

Connectionless

Flow control

Correct

Partially correct!

Connection-oriented

Correct

Partially correct!

Reliable

Correct

Partially correct!

12.

Question 12

How does an endpoint know the address of the DNS server?

1 / 1 point

The endpoint sends out a DNS Discover broadcast request to all endpoints on the local network.

It is manually configured in the network settings by the administrator or obtained from the DHCP server.

The endpoint sends an inquiry to the gateway and the gateway responds with the address of the DNS server.

The DNS server is always located on the gateway.

Correct

Correct!

13.

Question 13

What is the primary function of DHCP?

1 / 1 point

To collect host names present on a local network segment.

To translate domain names to IP addresses and vice versa.

To automatically assign IP addresses to systems.

To automatically assign MAC addresses to systems.

Correct

Correct!

14.

Question 14

Which Syslog layer handles the routing and storage of a Syslog message?

1 / 1 point

Syslog Content

Syslog Transport

Syslog Message

Syslog Application

Correct

Correct!

15.

Question 15

Which of the following flow data are gathered by utilities such as NetFlow?

1 / 1 point

Packet count and byte count.

Source and destination TCP/UDP ports.

Source and destination IP addresses.

Routing and peering data such as TCP flags and protocol.

All of the above.

Correct

Correct!

16.

Question 16

When a network interface card in operating in promiscuous mode, what action does it take?

1 / 1 point

The NIC sends out one false, or "promiscuous" packet for every legitimate packet it sends to interfere with eavesdropping operations.

The NIC sends all packets to the CPU for processing instead of only those packets indicated for its MAC address.

The NIC filters out dangerous or "promiscuous" packets.

The NIC forwards promiscuous packets to the Promiscuous Server.

Correct

Correct!

17.

Question 17

If a packet is allowed to pass through a NGFW based upon the established firewall rules and a new session is established, how does the NGFW treat the next packet it encounters from the same session?

1 / 1 point

Subsequent packets of the same session are automatically allowed.

The subsequent packets are inspected based on session-specific rules, not the packet-specific rules that were used to inspect the first packet in the session.

Subsequent packets that arrive within the Session Interval configured for that firewall will be allowed to pass without inspection. The first packet that arrives after the session interval expires will trigger the creation of a new session.

Every packet is inspected and allowed or denied based upon the same firewall rules that applied to the first packet.

Correct

Correct!

18.

Question 18

If your nontechnical manager told you that you must configure your next generation firewalls (NGFW) to block all users on your network from posting messages on Facebook from their office computers, what would be the consequence of carrying out his order?

1 / 1 point

You would have to block all access to Facebook from your network.

You would have to block all social media access from your network.

You would have to block all HTTP traffic from entering or leaving your network.

No serious consequence, application-level inspection and blocking can be configured.

Correct

Correct!

19.

Question 19

Monitoring network traffic and comparing it against an established baseline for normal use is an example of which form of intrusion detection?

1 / 1 point

Traffic Impact Analysis

Traffic Variance Analysis

Statistical anomaly-based detection

Signature-based detection

Correct

Correct!

20.

Question 20

Which are three (3) characteristics of a highly available system?

1 / 1 point

Redundancy

Correct

Partially correct!

Independence

Failover

Correct

Partially correct!

Geographically dispersed

Monitoring

Correct

Partially correct!