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Author: upravnik

The ARP table on a Cisco router

September 7, 2018January 19, 2019 upravnik

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 …

Uniform Resource Locator (URL) structure

September 7, 2018January 19, 2019 upravnik

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 …

Create a static host route

September 6, 2018January 19, 2019 upravnik

In one of the previous lessosn 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 …

Cisco console rollover cable

September 6, 2018January 19, 2019 upravnik

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 …

Encrypt local usernames and passwords

September 6, 2018January 19, 2019 upravnik

We’ve learned it is possible to configure local usernames and passwords on a Cisco device and then use them to login to the device. To do this, we’ve used the username USER password PASSWORD command, like in the example below: Read More …

no ip domain-lookup command

September 6, 2018January 19, 2019 upravnik

By default, any single word entered on an IOS device that is not recognized as a valid command is treated as a hostname to which you want to telnet. The device will try to translate that word to an IP Read More …

exec-timeout command

September 6, 2018January 19, 2019 upravnik

By default, an IOS device will disconnect a console or VTY user after 10 minutes of inactivity. You can specify a different inactivity timer using the exec-timeout MINUTES SECONDS line mode command. For example, to disconnect a console user after Read More …

logging synchronous command

September 6, 2018January 19, 2019 upravnik

By default, IOS displays syslog messages to the console users at any time, even during the typing of a command. Consider the following example: R1(config-if)#ip address 192.168.0.100 255.2 %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to down 55.255.0 Notice Read More …

Configure Cisco router as a DHCP client

September 6, 2018January 19, 2019 upravnik

Cisco routers can be configure as both DHCP servers and DHCP clients. An interface on a router that connects to the Internet Service Provider (ISP) is often configured as a DHCP client. This way, the ISP can provide the IP Read More …

show interfaces status command

September 6, 2018January 19, 2019 upravnik

The status of an interface on a Cisco switch can be checked using the show interface TYPE exec mode command. Consider the following example: SW1#show interfaces fa0/1 FastEthernet0/1 is up, line protocol is up (connected) Hardware is Lance, address is Read More …

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CONTENT #1

  • Networking basics
    • What is a network?
    • OSI & TCP/IP models
    • Local area network (LAN)
    • Wide area network
    • Encapsulation
    • Ethernet explained
    • Ethernet frame
    • MAC & IP addresses
    • Unicast, multicast, and broadcast addresses
    • Network devices
    • Half duplex and full duplex
    • IEEE Ethernet standards
    • Cisco three-layer hierarchical model
  • Cabling
    • Types of Ethernet cabling
    • Types of Ethernet cables – straight-through and crossover
  • IP addressing
    • Types of IP addresses
    • Classes of IP addresses
    • Subnetting explained
    • Subnet mask
    • Create subnets
    • CIDR (Classless inter-domain routing)
  • Network tools
    • Ping explained
    • Traceroute explained
  • Network protocols
    • TCP/IP suite of protocols
    • TCP explained
    • UDP explained
    • Ports explained
    • ARP (Address Resolution Protocol) explained
    • DHCP & DNS
    • Telnet & SSH
    • FTP & TFTP
    • SNMP (Simple Network Management Protocol)
    • HTTP and HTTPS explained
    • NTP (Network Time Protocol)
    • APIPA (Automatic Private IP Addressing)
    • ICMP (Internet Control Message Protocol)
    • IP header
  • Cisco IOS
    • Cisco IOS overview
    • Power on a Cisco device
    • IOS command modes
    • Get help in IOS
    • Running & startup configuration
    • IOS basic commands
    • show command
    • Configure descriptions
    • Run privileged commands within global config mode
    • Ports on an IOS device
    • Pipe character in IOS
    • IOS boot sequence
    • Backing up IOS configuration
  • IP routing
    • What is IP routing?
    • Connected, static & dynamic routes
    • Administrative distance & metric
    • Routing protocols
  • RIP
    • RIP overview
    • Configuring RIPv2
    • passive-interface command
    • RIP loop prevention
    • Advertise default routes using RIP
  • EIGRP
    • EIGRP overview
    • EIGRP configuration
    • EIGRP automatic & manual summarization
    • EIGRP authentication & load balancing
    • EIGRP Reliable Transport Protocol (RTP)
    • EIGRP Diffusing Update Algorithm (DUAL)
    • EIGRP summary
  • OSPF
    • OSPF overview
    • OSPF configuration
    • Designated & Backup Designated Router
    • OSPF authentication
    • OSPF summarization
    • OSPF summary
    • Differences between OSPF and EIGRP
  • LAN switching
    • Layer 2 switching
    • Collision & broadcast domain
    • CSMA/CD
  • VLAN
    • What is a VLAN?
    • Configuring VLANs
    • Configuring access & trunk ports
    • Frame tagging
    • IEEE 802.1Q
    • Inter-Switch Link (ISL)

CONTENT #2

  • ACLs
    • What are ACLs?
    • Types of ACLs
    • Configuring standard ACLs
    • Configuring extended ACLs
  • NAT
    • What is NAT?
    • Static NAT
    • Dynamic NAT
    • Port Address Translation (PAT) configuration
  • IPv6
    • What is IPv6?
    • IPv6 address format
    • Types of IPv6 addresses
    • IPv6 unicast addresses
    • IPv6 global unicast addresses
    • IPv6 unique local addresses
    • IPv6 link-local addresses
    • IPv6 multicast addresses
    • IPv6 address prefixes
    • IPv6 interface identifier
    • IPv6 transition options
    • IPv6 routing protocols
    • How to configure IPv6
    • RIPng
    • Differences between IPv4 and IPv6
  • Miscellaneous
    • Wildcard masks
    • Setting up Telnet
    • Setting up SSH
    • Port security
    • Types of memory on a Cisco device
    • Configure Cisco router as DHCP server
    • Configure NTP on a Cisco router
    • Cisco Discovery Protocol (CDP) overview
    • Map hostnames to IP addresses
    • Configure Cisco device as DNS client
    • Extended ping command
    • traceroute command
    • debug command
    • show processes command
    • Configure an IP address on a switch
    • Configure interVLAN routing
    • Configure ROAS
    • Configure static MAC address
    • Link Layer Discovery Protocol (LLDP)
    • IOS files
    • Configure speed and duplex
    • Interface range command
    • How to upgrade Cisco IOS
    • Copy files with FTP
    • show version command
    • TCP three-way handshake
    • Erasing configuration files
    • show interfaces status command
    • Configure Cisco router as a DHCP client
    • logging synchronous command
    • exec-timeout command
    • no ip domain-lookup command
    • Encrypt local usernames and passwords
    • Cisco console rollover cable
    • Create a static host route
    • Uniform Resource Locator (URL) structure
    • The ARP table on a Cisco router
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