Category: Miscellaneous

When a device is configured as a DHCP client, it will send a a broadcast packet to discover DHCP servers on the network. Broadcast packets are not forwarded by routers by default, so if a DHCP server is in a Read More …

It is recommended to set the correct timezone and adjust the DST setting before configuring a router as an NTP client. The syntax of the command used to set the timezone is: (config)clock timezone NAME HOURS [MINUTES] The name of Read More …

A default route defines where packets will be sent if no specific route for the destination network is listed in the routing table. If no default route is set, the router will discard all packets with destination addresses not found Read More …

Just like regular hosts, if a Cisco router wants to exchange frames with a host in the same subnet, it needs to know its MAC address. The IP-to-MAC address mapping are kept in the router’s ARP table. Consider the following Read More …

An URL is a string of characters that contains information about how to fetch a resource from its location. An URL specifies the primary access mechanism and the network location of a resource. A typical URL consists of the following Read More …

In one of the previous lessons we’ve defined a static route for a specific subnet by using the subnet mask of 255.255.255.0 in the ip route command. IOS also allows you to specify a static host route for a single Read More …

Prerequisites for 200-301 200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can Read More …

Syslog messages that appear on a Cisco device consists of several parts. Consider the following message: *Jan 18 03:02:42: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to down The message consists of the following parts: Jan 18 03:02:42 – Read More …

Syslog is a standard for message logging. Syslog messages are generated on Cisco devices whenever an event takes place – for example, when an interface goes down or a port security violation occurs. You’ve probably already encountered syslog messages when Read More …

A rollover cable is usually shipped with each Cisco device. This cable connects a serial port on your computer to the console port of the device and it is used for the device’s initial configuration. It is called rollover because Read More …