Why Haven’t You Booked Wing Han Tsang for a Private Function? |
- Why Haven’t You Booked Wing Han Tsang for a Private Function?
- Settlement agreements are safe havens?
- CCNA Semester 2 chapter 4
- CCNA Semester 2 chapter 3
- CCNA Semester 2 chapter 2
- CCNA Semester 2 chapter 1
- CCNA Semester 1 chapter 11
- CCNA Semester 1 chapter 10
- CCNA Semester 1 chapter 9
- CCNA Semester 1 chapter 8
- CCNA Semester 1 chapter 7
- CCNA Semester 1 chapter 6
- CCNA Semester 1 chapter 5
- CCNA Semester 1 chapter 4
- CCNA Semester 1 chapter 3
- CCNA Semester 1 chapter 2
- CCNA Semester 1 chapter 1
- Lab 1 - CCNA Implementation SIM
- Configuring DHCP Server
- Switching - Introducing Spanning Tree Protocol (STP)
| Why Haven’t You Booked Wing Han Tsang for a Private Function? Posted: 08 Nov 2009 06:00 AM PST
Move over Susan Boyle, there's a new "virtuoso" in town! See the original post: |
| Settlement agreements are safe havens? Posted: 08 Nov 2009 04:13 AM PST
Are settlement agreements the new save haven for bad medical equipment? See the original post: |
| Posted: 04 Nov 2009 05:02 PM PST
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| Posted: 07 Oct 2009 08:47 AM PDT
1. Which computer component is considered the nerve center of the computer system and is responsible for processing all of the data within the machine? RAM * CPU video card sound card operating system 2. What are two advantages of purchasing a preassembled computer? (Choose two.. * usually a lower cost exact components may be specified extended waiting period for assembly * adequate for performing most general applications suited for customers with special needs 3. A user plans to run multiple applications simultaneously on a computer. Which computer component is essential to accomplish this? * RAM NIC video card sound card storage device       |
| Lab 1 - CCNA Implementation SIM Posted: 07 Oct 2009 01:47 AM PDT
Drag the appropriate device icons to the labeled Device Drag the appropriate connections to the locations labeled Connections. Drag the appropriate IP addresses to the locations labeled IP address (Hint: use the given host addresses and Main router information) To remove a device or connection, drag it away from the topology. Use information gathered from the Main router to complete the configuration of any additional routers. No passwords are required to access the Main router. The config terminal command has been disabled for the HQ router. The router does not require any configuration. Configure each additional router with the following: Configure the interfaces with the correct IP address and enable the interfaces. Set the password to allow console access to consolepw Set the password to allow telnet access to telnetpw Set the password to allow privilege mode access to privpw Note: Because routes are not being added to the configurations, you will not be able to ping through the internetwork. All devices have cable autosensing capabilities disabled. All hosts are PC's  Answer and explanation: Specify appropriate devices and drag them on the "Device" boxes For the device at the bottom-right box, we notice that it has 2 interfaces Fa0/2 and Fa0/4 -> it is a switch The question stated that this topology contains 3 routers and 1 switch -> two other devices are routers Place them on appropriate locations as following:  (Host D and host E will be automatically added after placing two routers. Click on them to access neighboring routers) Specify appropriate connections between these devices: + The router on the left is connected with the Main router through FastEthernet interfaces: use a crossover cable+ The router on the right is connected with the Main router through Serial interfaces: use a serial cable + The router on the right and the Switch: use a straight-through cable + The router on the left and the computer: use a crossover cable  From Main router, use show running-config command:  From the output we learned that the ip address of Fa0/0 interface of the Main router is 192.168.152.178/28. This address belongs to a subnetwork which has: Increment: 16 (/28 = 255.255.255.240 or 1111 1111.1111 1111.1111 1111.1111 0000) Network address: 192.168.152.176 (because 176 = 16 * 11 and 176 < 178) Broadcast address: 192.168.152.191 (because 191 = 176 + 16 - 1) And we can pick up an ip address from the list that belongs to this subnetwork: 192.168.152.190 and assign it to the Fa0/0 interface the router on the left Use the same method for interface Serial0/0 with an ip address of 192.168.152.172 Increment: 16 Network address: 192.168.152.160 (because 160 = 16 * 10 and 160 < 172) Broadcast address: 192.168.152.175 (because 176 = 160 + 16 - 1) -> and we choose 192.168.152.174 for Serial0/0 interface of the router on the right Interface Fa0/1 of the router on the left IP (of the computer on the left) : 192.168.152.129/28Increment: 16 Network address: 192.168.152.128 (because 128 = 16 * 8 and 128 < 129) Broadcast address: 192.168.152.143 (because 143 = 128 + 16 - 1) -> we choose 192.168.152.142 from the list Interface Fa0/0 of the router on the right IP (of the computer on the left) : 192.168.152.225/28Increment: 16 Network address: 192.168.152.224 (because 224 = 16 * 14 and 224 < 225) Broadcast address: 192.168.152.239 (because 239 = 224 + 16 - 1) -> we choose 192.168.152.238 from the list Let's have a look at the picture below to summarize Configure two routers on the left and right with these commands: Router1 = router on the left Assign appropriate IP addresses to Fa0/0 & Fa0/1 interfaces: Router1>enable Router1#configure terminal Router1(config)#interface fa0/0 Router1(config-if)#ip address 192.168.152.190 255.255.255.240 Router1(config-if)#no shutdown Router1(config)#interface fa0/1 Router1(config-if)#ip address 192.168.152.142 255.255.255.240 Router1(config-if)#no shutdown Set passwords (configure on two routers) + Console password: Router1(config-if)#exit Router1(config)#line console 0 Router1(config-line)#password consolepw Router1(config-line)#login Router1(config-line)#exit + Telnet password: Router1(config)#line vty 0 4 Router1(config-line)#password telnetpw Router1(config-line)#login Router1(config-line)#exit + Privilege mode password: Router1(config)#enable password privpw Save the configuration: Router1(config)#exitRouter1#copy running-config startup-config Configure IP addresses of Router2 (router on the right) Router2>enable Router2#configure terminal Router2(config)#interface fa0/0 Router2(config-if)#ip address 192.168.152.238 255.255.255.240 Router2(config-if)#no shutdown Router2(config-if)#interface serial0/0 Router2(config-if)#ip address 192.168.152.174 255.255.255.240 Router2(config-if)#no shutdown and set console, telnet and privilege mode passwords for Router2 as we did for Router1, remember to save the configuration when you finished       |
| Posted: 07 Oct 2009 01:31 AM PDT
What is DHCP?The DHCP (Dynamic Host Configuration Protocol) is an Internet protocol responsible for automating the configuration of computers which use TCP/IP. DHCP can be used to assign IP addresses to computers by delivering TCP/IP configuration addresses such as IP address, subnet masks, default routers and DNS addresses. It can also be used to provide information for a number of other services such as printers, time, news and TFTP servers.ConfigA Cisco router can be configured as a DHCP server to assign IP addresses. The range of IP addresses which can be given out is called a 'pool'. From this pool clients are leased addresses for a given time, after which the lease expires and the client needs to request a new IP address lease.The following config lines show how to setup a DHCP pool of addresses in the 192.168.0.0 IP range: no ip dhcp conflict logging The config above also shows how to set the Default Gateway and DNS Servers which are assigned to clients. The Ethernet address of the switch is "00:07:eb:94:73:c0" and I wanted to assign a manual IP address 192.168.0.100 to it. So I declared: ip dhcp pool switch Afterwards, as I did a "show ip dhcp binding" on the router, I get the following results: router1#sh ip dhcp binding       |
| Switching - Introducing Spanning Tree Protocol (STP) Posted: 06 Oct 2009 12:41 AM PDT
A loop avoidance mechanism called STP has been developed to alleviate the 3 issues above. There are two varieties of Spanning Tree Protcol, STP (802.1d) and RSTP ('Rapid' 802.1w) both work in a similar way. A Spanning Tree Algorithm examines the switched network, and, through a series of decisions (discussed below) places each port in the loop into either Forwarding or Blocking state, therefore breaking the loop. Types of port in STP:
The process the switches go through to decide which port they place in blocking or forwarding state is governed by the position of a 'Root Switch' (also known as 'Root Bridge'):
 Once the switches have all assigned ports then the switched network is said to be "Converged". As discussed above the BID is made up of:
The Priority Value of the BID can be manually changed by an administrator, this is useful of you want to force a switch in the middle of a network to be a Root Switch. note: If a newer switch is plugged into a working network of a different manufacturer it may disrupt the network if manual BID priorities are not set. A Cisco Switch (MAC Vendor ID 00000C) will win over a 3COM switch (MAC Vendor ID 001AFC) because Cisco equipment has a lower MAC address. STP is switched on in all Cisco switches by default, if you have no loops for example:  You could switch STP off on all the switches, but this is not advisable, as all it would take is someone to plug a cable in the wrong port to cause a loop. note: If two links between two switches, the decision of which port to block can no longer be based on the BID because they would be the same for both links, the selection is therefore made on the lowest port number.  During the STP selection process ports can be in one of the following statuses:
* Ports in Listening & Learning state can take upto 30 seconds, during which no traffic will pass through the port. This may disrupt services such as DHCP and Network Neighborhood. Switching on 'portfast' by using the "spanning-tree portfast" command will skip the Listening and Learning stage. Do not set portfast on inter switch ports or branch ports, however you could set portfast on a leaf port (ports connected to hosts).       |
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