Top posts

  • Cisco IOS File System

    28 December 2013 ( #cisco 2960 switch )

    Every Catalyst switch requires an operating system to ensure the ongoing operation of the switch, as well as ensure the configuration applied to the switch is implemented by the various hardware components. Cisco Catalyst switches include a main operating...

  • Cisco ospf lsa types

    09 January 2014 ( #Cisco 3750 )

    Type-1 LSA – It’s is the Router LSA; this is defined in order to send the link state information about the attributes of the directly connected routes, besides of that you have just ONE type-1 LSA per every router inside your area. Type-2 LSA – It’s the...

  • VLANs, Trunk and Access ports

    02 April 2014 ( #Cisco 3560X )

    Let’s talk about VLANs today. Some time ago a friend of mine made me a question. If two PCs are connected to two different switches and they are in two different VLANs, however, the switches are connected to each other with access ports (each belonging...

  • Blocking and listening state in STP

    08 February 2014 ( #cisco 2960 switch )

    Question: In blocking state switch ports will only listen BPDUs but not forward BPDUs. If yes then how this switch is receiving BPDUs from other switches since other switch ports will also be in "disable" state so they can not send BPDUs. I heard that...

  • Calculate OSPF cost

    28 December 2013 ( #cisco route )

    Question: I need to know how to calculate OSPF cost i mean suppose i put this command in both routers which are connected to each others using FastEthernet bandwidth 5120 i thought cost would be 100/5120=51 but when issued sh ip ospf interface command...

  • How to find the actual boot image on cisco catalyst 6503 E

    29 December 2013 ( #Cisco 6500 )

    Question: I would like to verify what is the actual boot image running on my catalyst 6503 E SUP 2T. My IOS is s2t54-adventerprisek9-mz.spa.151-2.sy.bin and my Rommon is ok with the version 12.2(50r)sys3. I tried many command without any success. Here’s...

  • Cisco 3750 Switch PBR

    30 December 2013 ( #Cisco 3750 )

    Question: I want to use Catalyst 3750 PBR to reroute traffic. the traffic match the following ACL are route normally, all other traffic destination to 172.22.0.0/16 are route to 172.16.52.1 : source : 172.18.0.0/16 destination : 172.22.0.0/16 source :...

  • Cisco Port Sticky

    31 December 2013 ( #Cisco 3750 )

    Question: Im a little confused on port sticky command, Would it be more Likely to be used as a security for only allowing some devices to connect to a network, or to just keep trace of the devices that have been and currently are connected? Ive search...

  • How to prevent loop in OSPF

    02 January 2014 ( #Cisco 3750 )

    Question: Hi All, Kindly let me know this answer How do loop occur in OSPF and how to prevent ? WISH U ALL VERY HAPPY NEW AND PROSPEROUS Answer: There is no loop avoidance in OSPF,like those you would see in distance-vector routing protocols.The loop...

  • HSRP and DHCP

    04 January 2014 ( #Cisco 3750 )

    Question: I am new to Cisco and I am having few problems in configuring my topology in Packet tracer. I am having redundancy in router and swithes both, I have assigned one layer2 2960 switch as a VTP server and asssigned VLANs from that switch then assigned...

  • How to configure cisco ip multicast

    09 January 2014 ( #cisco 2960 switch )

    Question: I am currently working on a project where there is an urgent requirement to deliver an IP multicast solution. The network itself is fairly simple. IP Cameras as connected to pairs of Catalyst 2960 switches in 'access nodes'. There are 8 cameras...

  • Cisco CEF

    10 January 2014 ( #Cisco 3750 )

    Cisco Express Forwarding (CEF) is an advanced layer 3 switching technology used mainly in large core networks or the Internet to enhance the overall network performance. Although CEF is a Cisco proprietary protocol other vendors of multi-layer switches...

  • Cisco EIGRP Configure

    10 January 2014 ( #Cisco 3750 )

    Before you configure EIGRP, there are some things you should know about it first. Here they are: EIGRP is the Enhanced Interior Gateway Routing Protocol. EIGRP is a Cisco proprietary routing protocol based on their original Interior Gateway Routing Protocol....

  • The question about the snmp configure

    10 January 2014 ( #Cisco 3750 )

    Question: Since using version 5 I have one recurring issue with a couple of Cisco WS-C3750X-48T-L Stacks. When it runs the scan it returns the model and IOS version but no interfaces. After the scan snmp no longer works on the stack reporting 'queue length...

  • The basic ospf configure

    11 January 2014 ( #Cisco 3750 )

    OSPF is an interior gateway routing protocol that uses link states rather than distance vectors for path selection. OSPF propagates link-state advertisements rather than routing table updates. Because only LSAs are exchanged instead of the entire routing...

  • Cisco ospf DR and BDR

    11 January 2014 ( #Cisco 3750 )

    Each multi-access segment (ex: Ethernet Segment), will have 1 DR and 1 BDR. Each router on the segment forms a Full adjacency with the DR/BDR. Keep in mind that a router might be a DR/BDR on one of its attached multi-access networks, and it might not...

  • How to calculation OSPF metric

    11 January 2014 ( #Cisco 3750 )

    Question: Hello,I have some questions reagrding OSPF metric calculation. Within network configuration I have uploaded, I have shown two routing tables, with lines indicating which router they are from. I understand that the OSPF metric calcualtion uses...

  • The question about 2960 vlan implementation

    11 January 2014 ( #cisco 2960 switch )

    Question: A company with a flat network has an estate of 2960 switches. They also have Sophos UTM 425 devices with 4 spare ports. They need to implement VLANs with ACLs to segment the network. Is it possible to implement the ACLs on the switches? Or would...

  • The question about 2960 vlan implementation

    11 January 2014 ( #cisco 2960 switch )

    Question: A company with a flat network has an estate of 2960 switches. They also have Sophos UTM 425 devices with 4 spare ports. They need to implement VLANs with ACLs to segment the network. Is it possible to implement the ACLs on the switches? Or would...

  • The question about 2960 vlan implementation

    11 January 2014 ( #cisco 2960 switch )

    Question: A company with a flat network has an estate of 2960 switches. They also have Sophos UTM 425 devices with 4 spare ports. They need to implement VLANs with ACLs to segment the network. Is it possible to implement the ACLs on the switches? Or would...

  • The problem between layer 3 and layer 2 device

    12 January 2014 ( #cisco 2960 switch )

    Question: I have a WS-C2960S-24PS-L switch and its set only as an Access layer switch. uplinks arent even trunked. im using the native VLAN for mgmt and a different vlan for the users. the switch is being able to work as layer 2,switching packets. but...

  • How to check cisco switch loop

    12 January 2014 ( #Cisco 3750 )

    Question: How do I check the loop in Cisco switch? Answer: I think you are talking about forwarding loops seeming they can cause all sorts of wacky behavior in various Cisco switches. You will find basic troubleshooting and testing information below and...

  • Cisco 3560X vlan acl

    13 January 2014 ( #cisco 3560X )

    Question: I am having some issues getting ACL to function they way I would like. I have many clients on differnet vlans (vlan 6-10) and my ASA (10.1.99.254) on vlan 99 for internet access. I need vlans 6-10 to have access to the ASA for internet, but...

  • Cisco rip configure

    13 January 2014 ( #Cisco 3560X )

    IP RIP comes in two different versions: 1 and 2. Version 1 is a distance vector protocol and is defined in RFC 1058. Version 2 is a hybrid protocol and is defined in RFCs 1721 and 1722. The CCNA exam now primarily focuses on version 2. There are no major...

  • Cisco router and 3 layer switch

    14 January 2014 ( #Cisco 3750 )

    Question: I am really really confused with this. It is said that router's are more based on software thus they're slow compared to switches. Switches are more hardware based, and are very fast. Then why not make one device do all of the routing and switching....

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