Network Security

This article provides an overview of network security, its importance, and the various types of firewalls. It also discusses the implementation of network security systems and provides study material and solved assignments on network security.

TITLE: NETWORK SECURITY
Network Security

Abstract
Network security is the safety that is implemented to the systems to prevent them from
unauthorized access and risks. IT and Networking experts must ensure that there networks are very
secured from any external attack. In our daily life's, computers or phones uses network to make
transactions, communicate sensitive information, among other issues. Therefore a very secured
network should be ensured to prevent any data lose or breach in any case. If malicious hackers will
gain access then it will lead to great loses in a business. Security measures in computer networks
should be take to first priority among other securities (Peixiao, Chopra, Wing, Ganti, Corde, & Patil
2019).
Introduction
Firewall can be placed in your network with all the updated vulnerabilities and still wrongly
configured. This problem will create so many troubles. The configurations will cause the conflicts
in your settings within the network system. This will lead to poor performance in the network
within a company and also it will create some holes which external attackers can use it to gain
access to the networking due to conflicts within the firewall itself hence creating vulnerabilities.
Networking and IT experts must ensure that the configurations of the firewall will taken serious and
it is done professional way. Missed Security Patches is problem caused by poor management of the
network firewall software. Attackers always check the possible vulnerabilities and this might be
their gateway. IT and Network experts should always be careful and alert of the firewall tools since
it can cause significant problems. The vendors can assist fix some problems experienced on the
software. Management schedules must be set so as to allow careful monitoring and updating the
network firewalls no matter the situation whether there is attack or not (Yu, Qi, & Li, 2019).
Circuit-Level Gateways is more advanced application gateway and it works at the session layer of
the OSI Model. The significance of this gateway is it acts as the virtual connections between the
internal users and the remote host. It achieve it by creating connection between itself and the remote
host. It also secures and hides the IP addresses of the end users on the packets by removing and
adding its own IP address hence preventing the exposure of the IP addresses of the internal users
from the outside world. This secures so many threads that would have been received if the IP
address is exposed. Firewall is a type of network security system which monitors and controls
network traffic flowing in and out of network according to the network protocols. It acts as a wall
barrier between the internal network and the internet. Firewall can be in form of software or
hardware appliances. Hardware-based act as DHCP server from that network. In most cases experts
prefer software-based firewalls because it secures data from the internet threads. Routers uses
software-based firewalls since the data being transferred from one network to another must pass
internet hence it can also performs routing protocols. Firewalls are mainly used in private networks
to prevent any trouble of unauthorized access which maybe through internet. All the messages
moving in and out of intranet network must me examined and security measures checked by the
firewalls. Secured firewall configurations consist of both hardware and software devices. It is very
important type of security measures in the computer network (Peixiao, Chopra, Wing, Ganti, Corde,
& Patil 2019).

Network security system threads and requirements
Network security is the safety that is implemented to the systems to prevent them from
unauthorized access and risks. IT and Networking experts must ensure that there networks are very
secured from any external attack. In our daily life's, computers or phones uses network to make
transactions, communicate sensitive information, among other issues. Therefore a very secured
network should be ensured to prevent any data lose or breach in any case. If malicious hackers will
gain access then it will lead to great loses in a business. Security measures in computer networks
should be take to first priority among other securities (Yu, Qi, & Li, 2019).
Software tools such as antivirus can be used to detect and remove any malicious software in the
computer systems. Sometimes we might download software in one way or another with or without
knowledge. Therefore, antivirus will help us remove such malicious software build by hackers to
still personal information. This has really help a lot because while busy in computer then you can
mistakenly click download to anything on the screen. Modern antivirus nowadays do much more
than only protection from viruses but also from worms, Trojan-horses, spyware, among other
malicious programs .Caution must be taken to ensure computer data are save (Alm, 2019).
Intrusion detection systems are more advanced system software. Their main function is to monitor
and analyze malicious activities taking place in network then gives out the details about such
information by reporting them. They are also able to send any alerts to the experts about any
malicious activities taking place in the network. It can also do the resetting of connections in the
network to save IP address blockage in case there is no one to respond to such alerts. It can also
clean up unwanted transport and layers in network, prevent TCP sequencing, and also correct cyclic
redundancy check errors (Wnuk, Kościelny, Syfert, & Ciepiela, 2019, March).

Firewalls configurations from attacks
Firewall is a type of network security system which monitors and controls network traffic flowing
in and out of network according to the network protocols. It acts as a wall barrier between the
internal network and the internet. Firewall can be in form of software or hardware appliances.
Hardware-based act as DHCP server from that network. In most cases experts prefer software-based
firewalls because it secures data from the internet threads. Routers uses software-based firewalls
since the data being transferred from one network to another must pass internet hence it can also
performs routing protocols (Alm, 2019).
Firewalls are mainly used in private networks to prevent any trouble of unauthorized access which
maybe through internet. All the messages moving in and out of intranet network must me examined
and security measures checked by the firewalls. Secured firewall configurations consist of both
hardware and software devices. It is very important type of security measures in the computer
network (Wnuk, Kościelny, Syfert, & Ciepiela, 2019, March).

Types of Firewalls
1) Packet Filters
Packet Filters works in network layer of OSI model. It uses set of rules where it will have to decide
whether to forward or discard messages through the network. For instance, it can make a decision of
blocking or disallow all the data transfer from specific IP address or all traffic from UDP protocol.
In other scenarios it may make default decisions of allowing all or discarding all of the packets in
the network (Peixiao, Chopra, Wing, Ganti, Corde, & Patil 2019).
Security threats to Packet Filters:
a) IP address spoofing:
In this situation, the malicious attackers sends a packet to the intranet network using the same IP
address as the internal users IP address. Firewalls can overcome this by not allowing any packet
from outside the internal network to be received by internal users from internet (Alm, 2019).

b) Source routing attack:
In this kind of attack, the attacker specifies the route to send the packet with the hope of tricking the
firewall to allow packet transfer. Firewall will overcome this situation by just discarding all the
packets which tries to use source routing options (Peixiao, Chopra, Wing, Ganti, Corde, & Patil
2019).
2) Stateful Inspection Firewalls
It is also referred to as 'Dynamic Packet Filters'. It is always keep it self to active connections and
this will allow them to decide which packet to allow for the transfer. Due to this state of
functioning, it adapts itself current information exchange in the network and starts to work
according to the network function. This is the modern way not like the previous versions of
hardcore and stateless filters (Yu, Qi, & Li, 2019).

3) Circuit-Level Gateways
This is more advanced application gateway and it works at the session layer of the OSI Model. The
significance of this gateway is it acts as the virtual connections between the internal users and the
remote host. It achieve it by creating connection between itself and the remote host. It also secures
and hides the IP addresses of the end users on the packets by removing and adding its own IP
address hence preventing the exposure of the IP addresses of the internal users from the outside
world. This secures so many threads that would have been received if the IP address is exposed
(Wnuk, Kościelny, Syfert, & Ciepiela, 2019, March).
4) Missed Security Patches
This problem is caused by poor management of the network firewall software. Attackers always
check the possible vulnerabilities and this might be their gateway. IT and Network experts should
always be careful and alert of the firewall tools since it can cause significant problems. The vendors
can assist fix some problems experienced on the software. Management schedules must be set so as
to allow careful monitoring and updating the network firewalls no matter the situation whether there
is attack or not (Peixiao, Chopra, Wing, Ganti, Corde, & Patil 2019).

5) Configuration Mistakes
Firewall can be placed in your network with all the updated vulnerabilities and still wrongly
configured. This problem will create so many troubles. The configurations will cause the conflicts
in your settings within the network system. This will lead to poor performance in the network
within a company and also it will create some holes which external attackers can use it to gain
access to the networking due to conflicts within the firewall itself hence creating vulnerabilities.
Networking and IT experts must ensure that the configurations of the firewall will taken serious and
it is done professional way (Alm, 2019).

Designing and implementation of network security systems
Network security is the safety that is implemented to the systems to prevent them from
unauthorized access and risks. IT and Networking experts must ensure that there networks are very
secured from any external attack. In our daily life's, computers or phones uses network to make
transactions, communicate sensitive information, among other issues. Therefore a very secured
network should be ensured to prevent any data lose or breach in any case. If malicious hackers will
gain access then it will lead to great loses in a business. Security measures in computer networks
should be take to first priority among other securities (Yu, Qi, & Li, 2019).
Designing of network security system
Intrusion detection systems are more advanced system software. Their main function is to monitor
and analyze malicious activities taking place in network then gives out the details about such
information by reporting them. They are also able to send any alerts to the experts about any
malicious activities taking place in the network. It can also do the resetting of connections in the
network to save IP address blockage in case there is no one to respond to such alerts. It can also
clean up unwanted transport and layers in network, prevent TCP sequencing, and also correct cyclic
redundancy check errors. A virtual private network (VPN) is programming that guarantee safety and
encryption of connection in a very less secured network. A VPN functions in a public internet while
it strictly maintain the privacy through procedures. VPN encrypts the data from the sender and also
decrypt to the receiver, the network tunnel which the data is transferred cannot in anyway tamper
the data because encryption is very secured and they are not vulnerable. Also the network addresses
can also be presented by VPN (Peixiao, Chopra, Wing, Ganti, Corde, & Patil 2019).
Firewall is a type of network security system which monitors and controls network traffic flowing
in and out of network according to the network protocols. It acts as a wall barrier between the
internal network and the internet. Firewall can be in form of software or hardware appliances.
Hardware-based act as DHCP server from that network. In most cases experts prefer software-based
firewalls because it secures data from the internet threads. Routers uses software-based firewalls
since the data being transferred from one network to another must pass internet hence it can also
performs routing protocols (Alm, 2019).
Software tools such as antivirus can be used to detect and remove any malicious software in the
computer systems. Sometimes we might download software in one way or another with or without
knowledge. Therefore, antivirus will help us remove such malicious software build by hackers to
still personal information. This has really help a lot because while busy in computer then you can
mistakenly click download to anything on the screen. Modern antivirus nowadays do much more
than only protection from viruses but also from worms, Trojan-horses, spyware, among other
malicious programs .Caution must be taken to ensure computer data are save (Laborde, Bulusu,
Wazan, Barrère, & Benzekri, 2019, April).
Intrusion detection systems are more advanced system software. Their main function is to monitor
and analyze malicious activities taking place in network then gives out the details about such
information by reporting them. They are also able to send any alerts to the experts about any
malicious activities taking place in the network. It can also do the resetting of connections in the

network to save IP address blockage in case there is no one to respond to such alerts. It can also
clean up unwanted transport and layers in network, prevent TCP sequencing, and also correct cyclic
redundancy check errors (Shah, SHAH, & Shah, 2019).

Implementation of network design
IP address spoofing. In this situation, the malicious attackers sends a packet to the intranet network
using the same IP address as the internal users IP address. Firewalls can overcome this by not
allowing any packet from outside the internal network to be received by internal users from internet.
Source routing attack is a kind of attack where the attacker specifies the route to send the packet
with the hope of tricking the firewall to allow packet transfer. Firewall will overcome this situation
by just discarding all the packets which tries to use source routing options. Stateful Inspection
Firewalls also referred to as 'Dynamic Packet Filters'. It is always keep it self to active connections
and this will allow them to decide which packet to allow for the transfer. Due to this state of
functioning, it adapts itself current information exchange in the network and starts to work
according to the network function. This is the modern way not like the previous versions of
hardcore and stateless filters (Wnuk, Kościelny, Syfert, & Ciepiela, 2019, March).
Firewall can be placed in your network with all the updated vulnerabilities and still wrongly
configured. This problem will create so many troubles. The configurations will cause the conflicts
in your settings within the network system. This will lead to poor performance in the network
within a company and also it will create some holes which external attackers can use it to gain
access to the networking due to conflicts within the firewall itself hence creating vulnerabilities.
Networking and IT experts must ensure that the configurations of the firewall will taken serious and
it is done professional way. Missed Security Patches is problem caused by poor management of the
network firewall software. Attackers always check the possible vulnerabilities and this might be
their gateway. IT and Network experts should always be careful and alert of the firewall tools since
it can cause significant problems. The vendors can assist fix some problems experienced on the
software. Management schedules must be set so as to allow careful monitoring and updating the
network firewalls no matter the situation whether there is attack or not. Circuit-Level Gateways is
more advanced application gateway and it works at the session layer of the OSI Model. The
significance of this gateway is it acts as the virtual connections between the internal users and the
remote host. It achieve it by creating connection between itself and the remote host. It also secures
and hides the IP addresses of the end users on the packets by removing and adding its own IP
address hence preventing the exposure of the IP addresses of the internal users from the outside
world. This secures so many threads that would have been received if the IP address is exposed
(Laborde, Bulusu, Wazan, Barrère, & Benzekri, 2019, April).

Implementation of Virtual Private Network (VPN)
A virtual private network (VPN) is programming that guarantee safety and encryption of connection
in a very less secured network. A VPN functions in a public internet while it strictly maintain the
privacy through procedures. VPN encrypts the data from the sender and also decrypt to the receiver,
the network tunnel which the data is transferred cannot in anyway tamper the data because
encryption is very secured and they are not vulnerable. Also the network addresses can also be
presented by VPN (Shah, SHAH, & Shah, 2019)..
1) Remote access VPN
Remote access VPN clients have an access of organization's network through VPN gateway servers.
The gateway servers will only need the authenticated devices in order to allow access of the internal
network for the resources such as intranets, printers, file serves and scanners among others. It
requires IP Security (IPsec) or Secure Sockets Layer(SSL) for connection security (Wnuk,
Kościelny, Syfert, & Ciepiela, 2019, March).

2) Site-to-site VPN
Site-to-site VPN utilizes a gateway device to connect an entire network in one location to a network
in another location. The connection is more of direct connection. End-node devices in the remote
location do not need VPN clients because the gateway handles the connection (Yu, Qi, & Li, 2019).
3) Hardware VPN
Hardware VPN has so many great advantages as compared with the software-based VPN. Security
is also enhanced where it gives balance the data loads of the clients. Hardware VPN is relatively
expensive but very advantageous over the software Hardware VPN. The data security of the
businesses and organizations are guaranteed despite the big price (Peixiao, Chopra, Wing, Ganti,
Corde, & Patil 2019).

4) Dynamic multipoint virtual private network (DMVPN)
Dynamic multipoint virtual private network (DMVPN) is security VPN feature where the data
transfer between the sites is exchanged directly without the need of passing the traffic in the
headquarters VPN servers or routers. A DMVPN normally build a mesh VPN service which runs on
VPN routers and the firewall concentrators. The data here is very secured and no doubts about it
(Laborde, Bulusu, Wazan, Barrère, & Benzekri, 2019, April).
5) VPN Reconnect
VPN Reconnect is a feature that is only available in Windows 7 and Windows server 2008 R2
which allows the VPN connections open even after a brief interruption of the internet services. In a
scenario where the end user computer loose connection to a network, then this feature will be useful
in that situation (Wnuk, Kościelny, Syfert, & Ciepiela, 2019, March).

Terminal Access Controller Access-Control System plus(TACACS+)
Terminal Access Controller Access-Control System plus(TACACS+) is the feature that forwards
the username and the passwords to the central security servers. It is the most significant features in
all the security systems. TACACS+ uses the TCP as the communication protocol between remote
client and the security server. It encrypt the data link for security purpose on the remote database. It
also supports PAP, CHAP, and MS-CHAP authentication and also it is useful for both LAN and
WAN security (Laborde, Bulusu, Wazan, Barrère, & Benzekri, 2019, April).
Remote Authentication Dial-in User Service (RADIUS)
RADIUS has a feature of only encrypting the password in the access-request packet from the client
to the server. Other information will be left for the third part such as username, accounting and
authorized services. It combines both authentication and authorization features to accept packets
and make it difficult to decouple (Wnuk, Kościelny, Syfert, & Ciepiela, 2019, March).

Conclusion
Network security is the safety that is implemented to the systems to prevent them from
unauthorized access and risks. IT and Networking experts must ensure that there networks are very
secured from any external attack. In our daily life's, computers or phones uses network to make
transactions, communicate sensitive information, among other issues. Therefore a very secured
network should be ensured to prevent any data lose or breach in any case. If malicious hackers will
gain access then it will lead to great loses in a business. Security measures in computer networks
should be take to first priority among other securities. Firewalls are mainly used in private networks
to prevent any trouble of unauthorized access which maybe through internet. All the messages
moving in and out of intranet network must me examined and security measures checked by the
firewalls. Secured firewall configurations consist of both hardware and software devices. It is very
important type of security measures in the computer network (Shah, SHAH, & Shah, 2019)..

Reference
1. Shah, S., SHAH, K. R., & Shah, J. N. (2019). U.S. Patent Application No. 16/135,218.
2. Alm, A. (2019). Internet of Things mesh network: Using the Thread networking protocol.
3. Peixiao, L. I. N., Chopra, A., Wing, D. G., Ganti, V., Corde, C., & Patil, A. (2019). U.S. Patent
Application No. 16/112,648.
4. Laborde, R., Bulusu, S. T., Wazan, A. S., Barrère, F., & Benzekri, A. (2019, April). Logic-based
methodology to help security architects in eliciting high-level network security requirements. In
Proceedings of the 34th ACM/SIGAPP Symposium on Applied Computing (pp. 1610-1619). ACM.
5. Yu, H., Qi, H., & Li, K. (2019). WECAN: an Efficient West-East Control Associated Network for
Large-Scale SDN Systems. Mobile Networks and Applications, 1-11.
6. Wnuk, P., Kościelny, J. M., Syfert, M., & Ciepiela, P. (2019, March). The Issue of Adaptation of
Diagnostic System to Protect Industrial Control Systems Against Cyber Threads. In Conference on
Automation (pp. 258-267). Springer, Cham.