Archive for the ‘ITN’ Category

Disable Unused Services

Posted: 1st August 2020 by ccna7guru in ITN

Cisco routers and switches start with a list of active services that may or may not be required in your network. Disable any unused services to preserve system resources, such as CPU cycles and RAM, and prevent threat actors from exploiting these services. The type of services that are on by default will vary depending […]

Reconnaissance Attacks

Posted: 31st July 2020 by ccna7guru in ITN
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In addition to malicious code attacks, it is also possible for networks to fall prey to various network attacks. Network attacks can be classified into three major categories: Reconnaissance attacks – The discovery and mapping of systems, services, or vulnerabilities. Access attacks – The unauthorized manipulation of data, system access, or user privileges. Denial of service – The disabling or corruption […]

DHCP Operation

Posted: 23rd July 2020 by ccna7guru in ITN

The DHCP Process: •When an IPv4, DHCP-configured device boots up or connects to the network, the client broadcasts a DHCP discover (DHCPDISCOVER) message to identify any available DHCP servers on the network. •A DHCP server replies with a DHCP offer (DHCPOFFER) message, which offers a lease to the client. (If a client receives more than one […]

Remote-Access VPNs

Posted: 28th June 2020 by ccna7guru in ITN

In the previous topic you learned about the basics of a VPN. Here you will learn about the types of VPNs. VPNs have become the logical solution for remote-access connectivity for many reasons. As shown in the figure, remote-access VPNs let remote and mobile users securely connect to the enterprise by creating an encrypted tunnel. […]

Hello Packet in OSPFv2

Posted: 6th June 2020 by ccna7guru in ITN

The OSPF Type 1 packet is the Hello packet. Hello packets are used to do the following: Discover OSPF neighbors and establish neighbor adjacencies. Advertise parameters on which two routers must agree to become neighbors. Elect the Designated Router (DR) and Backup Designated Router (BDR) on multiaccess networks like Ethernet. Point-to-point links do not require […]


Posted: 1st June 2020 by ccna7guru in ITN

VTP version 3 provides some significant benefits to the network administrator: The ability to create a primary server was added. In VTP versions 1 and 2, all VTP server switches are equal; any one of them may add, remove, or rename VLANs and change their state. In VTP version 3, only the primary server can […]

Types of Malware

Posted: 31st May 2020 by ccna7guru in ITN

Adware Adware is usually distributed by downloading online software. Adware can display unsolicited advertising using pop-up web browser windows, new toolbars, or unexpectedly redirect a webpage to a different website. Pop-up windows may be difficult to control as new windows can pop-up faster than the user can close them. Ransomware Ransomware typically denies a user […]

Router as DHCP Server

Posted: 30th May 2020 by ccna7guru in ITN

Step I: Create the dhcp pool by NameRouter(config)#ip dhcp pool pool1 Step II: Assign network of IP addressRouter(dhcp-config)#network Step III: Assign a default gateway to that above mentioned poolRouter(dhcp-config)#default-router Step IV: Assign a dns to that above mentioned poolRouter(dhcp-config)#dns-server Router(dhcp-config)#?default-router Default routersdns-server Set name serverexit Exit from DHCP pool configuration modenetwork […]

NetAcad Digital Badges

Posted: 10th May 2020 by ccna7guru in ITN

A digital badge is a verified, portable and data-rich digital representations of demonstrated skills, learning outcome, achievement or experience.

Lab – Install Wireshark

Posted: 24th April 2020 by ccna7guru in ITN

Instructions Wireshark has become the industry standard packet-sniffer program used by network engineers. This open source software is available for many different operating systems, including Windows, Mac, and Linux. In this lab, you will download and install the Wireshark software program on your PC. Note: Before downloading Wireshark, check with your instructor about the software […]