Author: upravnik

By default, all interfaces on a Cisco switch are turned on. That means that an attacker could connect to your network through a wall socket and potentially threaten your network. If you know which devices will be connected to which Read More …

To enable secure access to your Cisco device, you can use SSH instead of Telnet. SSH uses encryption to secure data from eavesdropping. To enable SSH, the following steps are required: 1. set up a hostname and and a domain Read More …

To access a Cisco device using telnet, you first need to enable remote login. Cisco devices usually supports 16 concurrent virtual terminal sessions, so the first command usually looks like this: HOSTNAME(config)line vty 0 15 To enable remote login, the Read More …

Wildcard masks are used to specify a range of network addresses. They are commonly used with routing protocols (like OSPF) and access lists. Just like a subnet mask, a wildcard mask is 32 bits long. It acts as an inverted Read More …

The following table summarizes the major differences between IPv4 and IPv6:   Feature IPv4 IPv6 Address length 32 bits 128 bits Address representation 4 decimal numbers from 0-255 separated by periods 8 groups of  4 hexadecimal digits separated by colons Read More …

RIPng is an extension of RIP developed for support of IPv6. Here are some of its features: just like RIP for IPv4, it uses hop count as the metric sends updates every 30 seconds RIPng messages use the UDP port Read More …

Cisco routers do not have IPv6 routing enabled by default. To configure IPv6 on a Cisco routers, you need to do two things: enable IPv6 routing on a Cisco router using the ipv6 unicast-routing global configuration command. This command globally Read More …

Like IPv4, IPv6 also supports routing protocols that enable routers to exchange information about connected networks. IPv6 routing protocols can be internal (RIPng, EIGRP for IPv6…) and external (BGP). As with IPv4, IPv6 routing protocols can be distance vector and Read More …

IPv4 and IPv6 networks are not interoperable and the number of devices that use IPv4 number is still large. Some of these devices do not support IPv6 at all, so the migration process is necessary since IPv4 and IPv6 will Read More …

The second part of an IPv6 unicast or anycast address is typically a 64-bit interface identifier used to identify a host’s network interface. A 64-bit interface ID is created by inserting the hex value of FFFE in the middle of the Read More …