Chapter 11 Intro to Routing & Switching

 Upon completion of this chapter, you should be able to:  Configure a router with a basic configuration  Configure a serial WAN link with a clock rate  Configure a default route  Use CDP to identify neighboring Cisco devices

11.1

 Open up Packet Tracer & add:  A PC  2960 switch  1841 router w/ WIC-2T added in slot 0  Ethernet & console cables

 Configure:  Hostname- GCC  Enable password- cisco  Secret password- class  Con 0 & vty password- gcit  Encrypt all passwords  Fa0/0  Subnet need 5 networks; use the 1 st usable for this network 1 st in range for fa0/0 3 rd in range for PC

 Add:  Another 1841 w/ WIC-2T in slot 0  Connect with serial DCE cable from left to right S0/0/0 to s0/0/0  Another switch  Another PC  Connect with Ethernet and console cables

 Configure:  Hostname- GCEC  Enable password- cisco  Secret password- class  Con 0 & vty password- gcit  Encrypt all passwords  Fa0/0  2 nd usable range 1 st in range for fa0/0 3 rd in range for PC

 Real life serial (WAN) connection to ISP  Your router is a DTE  CSU/DSU is the DCE Connects to ISP network Provides a clocking rate for signal  External CSU/DSU or module for router

 DB-60 to V.35 Smart Serial

 On the serial port connected to CSU/DSU  DCE

 What is the purpose of a CSU/DSU?  Connect router to ISP & provide clock rate  What kind of cable would you connect from your router to a CSU/DSU?  Smart serial to DB-60  In our class/PT, on which type of port would you configure a clock rate on?  Serial  What is the command to configure the clock rate?  Router(config-if)# clock rate  Is your router normally a DCE or DTE?  DTE

11.2

 Router forwards packet to a destination network  Looks at routing table to see which port to go out  You can set a default route to go out if destination network is not in routing table

Default route using outgoing INT Default route using outgoing next hop IP

 What do you configure in a router to tell it “if you don’t have the destination network in the routing table, go this way.”  Default route  What are the 2 possible commands to configure a default route?  B(config)# ip route next hop IP  B(config)# ip route outgoing int  What does the quad zero mean?  Any network (IP/SM)  Which command encrypts all passwords?  Service password-encryption

11.3

 Shares info between directly connected Cisco devices (neighbors)  Runs on boot  Sends periodic CDP advertisements, every 60 sec.  Operate at Layer 2  Information gathered by CDP includes:  Device host name  Layer 3 addresses  What the directly connected port is, “serial 0/0/0”  Capabilities list – Router, Switch  Platform, for example Cisco 1841

 Why disable it?  PT

 Show cdp interface  Verify frequency sent P2R3#show cdp interface FastEthernet0/0 is up, line protocol is up encapsulation ARPA Sending CDP packets every 60 seconds Holdtime is 180 seconds

 What layer does CDP operate at?  Layer 2  How often do CDP advertisements get sent?  60 seconds  What does CDP do?  Discover neighboring Cisco devices  What command displays the table of neighboring devices?  B# show cdp neigbors

 What command turns CDP off for the router?  B(config)# no cdp run  Why would you turn CDP off?  Neighbors aren’t Cisco devices  Your Cisco router connects to a 3Com switch on Fa0/0 and a Cisco router on S0/0/0. What command will make the router not exchange CDP advertisements to the switch?  B(config-if)# no cdp enable

 Identify what each category in the table means.

 You configured a router with basic settings.  You know how a router connects to an ISP with a CSU/DSU.  You can identify DCE and DTE devices.  You know which cable connects from the router to the CSU/DSU.  You can configure a clock rate on a serial interface.  You can configure a default route and know why you should configure one.

 You know the purpose of CDP and how/when it is used.  You can read a CDP table and can backwards design the network based on the output.  You know which command is used to display the CDP table and the detailed output.  You can turn CDP off on the router and on the interface.

 Complete the study guide handout  Take the quiz on netacad.com  Jeopardy review

Chapter 11 Intro to Routing & Switching