which OSI layer is responsible for error correction nd which method is use for it..as far i have studied i thnk data link layer perform both error detection and correction..?
View 6 RepliesThis setting is correct?
PIX Version 6.3(3)
interface ethernet0 auto
interface ethernet1 auto
[Code]...
I have two WAP4410N plugged into my Catylist 3560 switches.One of these switches is my Default Gateway for the LAN.The only way I can get a device to connect to the WAP4410N is by assigning it a static IP. Then it works perfectly.
View 10 Replies View RelatedI want to setup VLAN with the switches SG300 and SLM2024. What is the suggestion to connect these 2 switches. We have the Juniper net screen.
View 1 Replies View RelatedI have a question if I Stack a Catalyst 3750 L3 with a Catalyst just L2, will we able to use all L3 capabilities?
Switches are
WS-C3750G-24TS-E1U
WS-C3750V2-24PS-S
I am taking an introduction class to CCNA and we are focusing on the Application Layer,and I'm having some difficulty in understanding what is an Application Layer Service. Is the Application Layer Service the same as Application Layer Software?
View 3 Replies View RelatedThe router 1841 is connected directly to the layer switch. the network diagram is below:
Office A --> Switch (L3) --> Router 1841 --> Internet --> Office B
However, when I transfer the file from Office A to office B, the speed very slow ( only around 40 kb/second), and there are an input error and CRC error:
Cisco-R1841#sh interfaces FA0/1
FastEthernet0/1 is up, line protocol is up
Hardware is Gt96k FE, address is 0019.e02f.03dd (bia 0019.e02f.03dd)
[Code]......
I'm trying to open certain websites but the browser gives me this message: "Network Error (tcp_error) A communication error occurred: "Operation timed out" The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time.
View 8 Replies View Relatedi'm currently studying at a college which has a website with a student intranet that is available to log in from any computer. So far it has been working well and I can log in on my home laptop and upload documents and look at presentations etc. Today for no reason when I try and log in I get the message Error Code 500: Internal Server Error and the webpage does no appear.I have had no problems previously and this has only happened today and yesterday, I went down to the college and accessed the website fine from the computers in the library but still no joy from my home computer.
View 1 Replies View RelatedHere is a second paragraph from official BCMSN book page 93:
View 6 Replies View RelatedI have :
- two different subnets (S1, S2)
- these subnets are connected to an IP backbone via wirelles acces points
I would like to physically connect these subnets together so the networks devices in S1 could directly communicate with the devices in S2 and vice versa without going through the backbone.
The obvious solution seems to interconnect these subnets with a router or a switch L3. But I would like to connect these subnets and stay at layer 2.
So, is it possible to connect S1 and S2 with a switch L2 ? If I do that, what is going to happen? Can I create just one subnet S3 from this two subnets when I connect them together and have my two separate subnets back as soon as I disconnect them?
SM-ES3-16-P works as a layer 3 module which means that the uplink which connects to router ( Internally ) is a layer 3 interface . Is there a way we can use it as a layer 2 switch and connect the uplink as a trunk port ?
View 1 Replies View RelatedI need a ≥ 8 port layer 3 managed switch. What would be the cheapest solution for this?I've been looking at some stuff like Cisco 4908G, but that only supports 1000base-X. I need something that supports the standard 1000base-T. I've also looked at a Cisco WS-C3508G-XL-EN, but correct me if I'm wrong, this is only layer 2?
View 11 Replies View Relatedi am trying to do EoMPLS using microwave as my Layer 1. i am doing the same thing using Fiber as my layer 1 and it is working. the minute i use microwave its not working. the EVC will be showing as up, but no traffic will be moving. i am using 2 3750Metro series swicthes. i have tries to tweek the MTU to be above 1500 and below 1500 but nothing is working. LDP is establishing, OSPF is working, but the EVC is just not forwadign traffic from end to end.
View 4 Replies View RelatedData link-ARP,RARP, presentation-SSL,TSL,ASCII,JPG, Session layer-ASP(apple talk session protocol),SCP are these correct?can your provide 2 new protocols for each with the long name?
View 17 Replies View RelatedI managed to narrow down my question to this.SOCKS5 proxy is able to handle both TCP and UDP transport protocols.If I have IPinIP encapsulated tunnel, will this work?
in other words, does SOCKS5 expect Layer 4 header immediately after Layer 3 header or not?
I have a question about QoS and how, or if, it functions between a layer 2 switch and a router. My question is, can a frame's COS sent from a layer 2 switch to a router be recognized and converted (mapped) to a DSCP setting without the use of a vlan (not the native vlan1), and can the reverse be done from a router to a layer 2 switch? Can QoS be preserved as it passes through the different devices? I know, pretty basic, but I have to start somewhere.
View 12 Replies View RelatedI am looking for a certified (e.g. by the ITU) traffic model for the OSI layer 3 & 4. (TCP/IP). If there are definitions for different kinds of traffic, like idle-traffic (protocol only), surfing, file-transfer and all these mixed up.The reason why i am looking for it is that i am actually working at my bachelor thesis and need to simulate network traffic and its behaviour in/at a router. In particular i want to simulate the RTO (retransmission timeout) of a router with "realistic" traffic.
View 12 Replies View RelatedWhy layer 2 switches need its mac address, even it does not have any interface ? (does not have stp and etc)
View 8 Replies View Relatedcan i use normal two L3 Switch(3560) for BGP Multihoming with 2 different isp
View 4 Replies View RelatedI'm looking to get a layer 3 managed switch. The HP we currently have only does layer 2.I'm looking at a HP v1910-24g. It has 24 10/100/1000 ports and looks to be layer 3 as well.It looks like they can be had for around $350.Anything different I should be looking at with similar specs? Any issues with the v1910-24g?
View 19 Replies View RelatedN5K will be running on Layer 2 mode. vPC configured between N5K and N2K Servers are part of Vlan 10, 20, 30 and Juniper SRX firewall is the gateway for all the servers. SRK firewall is Active/Standby mode.
Questions are
1) Is there any non-vPC link required between N5K in this scenario?
2) N5K will pass in/out traffic to juniper SRX firewall durining SRX failover as well as normal operation
What does a firewall block at the transport layer?
View 1 Replies View RelatedI know I can bring up a tunnel up-and-up without any layer 3 address, without any ipv4 or ipv6 address (apart from tunnel source/destination of course). And I don't have to use "ip unnumbered <interface>" either. But what good is a tunnel interface with no address? Can you bridge them or something?
View 5 Replies View RelatedI have two MLS conected by 2 fast ethernet links f0/11 and f0/12 on both sides.I am trying to set up a layer 3 etherchannel using these two links . But when i see etherchannel summary, they dont show up as layer 3. Instead they show as layer 2.
View 19 Replies View RelatedWith most of my Layer2/Layer3 switches, I'm accustom to giving them a SVI on my management VLAN, and calling it a day. I can't find in the Cisco Nexus guides how to do something similar; everything points to the mgmt0 physical interface, which seems like I need to uplink it to an access port on another switch. Can somebody point me in the right direction for how to do give the Nexus an IP that I can ssh/snmp into it across a trunk for management? I must just be missing the keyword.. NX-OS is still quite a different beast.I see in the manual it says: "SSH has the following prerequisites: You have configured IP on a Layer 3 interface, out-of-band on the mgmt 0 interface or inband on an Ethernet interface." Cisco Nexus 5000 Series Switch CLI Software Configuration Guide page 284, How do I configure an IP on a Layer 3 interface on a Nexus?
View 16 Replies View RelatedI just inherited a network and feel like.I am missing something. We use ATT&T Opt-E-Man which limits the MAC address to 50 for the connection or you have to pay.Hence the routing VLAN is the only access across the two sites.I have a VoIP vendor who insists on using the same VLAN for all sites. Upon exam the VLAN is at the remote site but it does not work.
View 2 Replies View RelatedI have a WLC 3750 with 41 APs. We use Web Authentication with the combination of a layer 2 security feature (WPA/WPA2 with PSK). With this combination some clients have the problem that they get deauthenticated and have to authenticate again while being in an active session. For testing I disabled the layer 2 security feature i.e. I set it to "none" but I left the Web Authentication enabled. With these settings none of the clients has any more problems with getting deauthenticated. They stay online for the entire session.
View 5 Replies View RelatedI have the following scenario. Connected to a Cisco 3560 switch (fa0/9) is another Cisco switch (that is operating at layer 2). On the other side of that second switch is a firewall. I want to send traffic from my Cisco 3560 switch to a network behind the firewall. [code] However, when I try to add the ip address to int fa0/9, I get an error. Right now, the 3560 is operating at layer 2. I think that I need to issue the command: "ip routing" to put it in layer 3, then put the ip address on port fa0/9. However, I am concerned that I will mess up my production environment. Is there any other way of doing this? The "ip route 0.0.0.0 0.0.0.0" statement sends traffic out the gateway to the Internet. I just want to send packets to 209.52.62.16/28 out int fa0/9.
View 2 Replies View RelatedI have a situation where I have ethernet traffic from two separate networks/ip subnets (Subnet A and Subnet B) on a single ethernet connection. I have the need to separate the traffic into two separate networks and two isolated broadcast domains. I thought this could easily be accomplished with a Cisco 300 Layer 3 switch, but I can't get it to work correctly. I have the switch set to IP routing mode. I have three VLANs configured. VLAN 1 sees the combined Layer 2 & 3 ethernet traffic for both subnet A and subnet B. VLAN 10 has an IP address assigned from subnet A and is the gateway for devices within that subnet. VLAN 20 has an IP address assigned from subnet B and is the gateway for devices within that subnet. IP proxy arp is on by default and should be active.Devices in VLAN 10 can ping devices in VLAN 20 and devices in VLAN 20 can ping devices in VLAN 10. This appears to be working only because the switch is the default gateway for those components.
No devices or servers in VLAN 1 can ping VLAN 10 or VLAN 20 components, and VLAN 10 and VLAN 20 components can not ping VLAN 1. I analyzed the ARP traffic on VLAN 1 and the switch is not responding with its own MAC address for requests for IPs for active devices connected to VLAN 10 or VLAN 20. The Cisco documentation says that the device should be responding and acting as a router.I can not physically connect everthing on VLAN 1 directly to the switch, I can not make the switch the default gaeway for all devices on VLAN 1, and I can not create static routes directly to the VLAN 1 switch IP address for all devices that are part of VLAN 1, so I am stuck. I need the switch to let VLAN 1 components automatically know what is connected to VLAN 10 and VLAN 20.
I am willing to scrap this approach entirely if there is an easier way to do this. Put simply, I have a few devices in Subnet A that need to be isolated from Layer 2 & 3 traffic destined for a few devices in Subnet B, but I can't reconfigure my entire network to create these isolated broadcast domains.
We have a potential new customer who is wanting to deploy a guest WLAN. I am happy doing this via a VLAN on the WAP4410N series AP’s. I would then create the relevant VLAN’s on the switch. Can each VLAN be assigned an IP address and allowing me to be able to add a static route on the router pointing the traffic for the Guest VLAN back to the switch?
View 1 Replies View RelatedI am currently working on my first ASA5510 configuration and am running into some issues. The ASA is running 8.2(5). The network setup is as follows:Layer 3 switch with 4 VLANs with ip routing enabled.All systems are pointing to the 3560 as their default gateway. ip route 0.0.0.0 0.0.0.0 10.20.100.30 (asa)The ASA is directly connected to the L3 switch on one of the VLANs. The other VLANs are not established on the ASA, but static routes have been created for them on the ASA.I am able to ping the ASA from the switches, etc.I am able to ping the switches from the ASA When connected to VPN Client to ASA, I am unable to reach anything behind it. When at the office, I am unable to reach the internet from the ASA.The following NAT configuration is in place on the ASA;
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 0.0.0.0 0.0.0.0
I found that when I enabled layer 2 auto QoS in 3560 switch, I need to wait so much time to open a file in network drive. Howerver, when I disable the Qos. It can improve a lot. I have used a sniffer to capture the packet to see. Those default packet is in DSCP 0. Therefore, I think majority packet will drop to queue 4. How can I increase the buffer and threshold in order to improve queue 4 performance.
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