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Hi,<br />
<br />
1) This is related to the CCNA Exam.<br />
2) This is related to the discussion at one of the prep test<br />
3) There is an error of this router's configuration:<br />
R1#config t<br />
R1(config)#int fa0/0<br />
R1(configi-if)#ip address 192.168.1.17 255.255.255.0<br />
R1(config-if)#no shutdown<br />
R1(config-if)#exit<br />
R1(config)#int s0/0<br />
R1(config-if)#ip address 192.168.1.65 255.255.255.240<br />
R1(config-if)#no shutdown<br />
&nbsp; / 192.168.1.0 &nbsp;overlaps with FastEthernet0/0<br />
4)The given answer: The subnet mask of the FastEthernet interface should be changed to 255.255.255.240<br />
5)My question: Please say it with your own wordings, but you can give any &quot;links&quot; if necessary: i) Could you show me why we have to change the subnet mask of the FastEthernet interface to 255.255.255.240<br />
6) Thank you<br />
<br />
tjie
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Hi,

1) This is related to the CCNA Exam.
2) This is related to the discussion at one of the prep test
3) There is an error of this router's configuration:
R1#config t
R1(config)#int fa0/0
R1(configi-if)#ip address 192.168.1.17 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#int s0/0
R1(config-if)#ip address 192.168.1.65 255.255.255.240
R1(config-if)#no shutdown
  / 192.168.1.0  overlaps with FastEthernet0/0
4)The given answer: The subnet mask of the FastEthernet interface should be changed to 255.255.255.240
5)My question: Please say it with your own wordings, but you can give any "links" if necessary: i) Could you show me why we have to change the subnet mask of the FastEthernet interface to 255.255.255.240
6) Thank you

tjie

CCNA Exam: Router's configuration

Transmission Control Protocol/Internet Protocol (TCP/IP) is the set of networking protocols that define end-to-end connectivity specifying how data should be packeted, addressed, transmitted, routed and received at the destination. This functionality is organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.

TCP/IP

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.