We kick off the CCNA series from the beginning. Operation of IP data networks is weighted as 5% in the CCNA RS blueprint. The first topic is:
1.1 Recognize the purpose and functions of various network devices such as routers, switches, bridges and hubs
Router
A router is a device that routes between different networks, meaning that it looks at the IP header and more specifically the destination IP of a packet to do forwarding. It uses a routing table which is populated by static routes and routes from dynamic protocols such as RIP, EIGRP, OSPF, ISIS and BGP. These routes are inserted into the Routing Information Base (RIB). The routes from different sources compete against each other and the best route gets inserted into the RIB. To define how trustworthy a route is, there is a metric called Administrative Distance (AD). These are some of the common AD values:
0 Connected route 1 Static route 20 External BGP 90 EIGRP 110 OSPF 115 ISIS 120 RIP 200 Internal BGP 255 Don't install
If a value of 255 is used, the route will not installed in the RIB as the route is deemed not trustworthy at all.
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Learn how providers can lay the groundwork for networks with ultra-high bandwidth, ultra-low latency, context-based control, network slices, and distributed deployment.
I run collectd stats on many of my servers and one thing I enable on some (but not all) of the
How VMware's own value got virtualized.
Network Break 57 delves into Dell and EMC and looks at upheavals affecting Juniper, Cisco, and AT&T. We also run from a new Verizon zombie tracking cookie, and opine on the rest of the week's tech news.
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This vendor-written tech primer has been edited by Network World to eliminate product promotion, but readers should note it will likely favor the submitter’s approach.
From Target to Ashley Madison, we’ve witnessed how interconnections with third-party vendors can turn an elastic environment -- where devices, services and apps are routinely engaging and disengaging -- into a precarious space filled with backdoors for a hacker to infiltrate an enterprise’s network. Here are the top five threats related to working with 3rd parties:
Threat #1 - Shared Credentials. This is one of the most dangerous authentication practices we encounter in large organizations. Imagine a unique service, not used very frequently, requiring some form of credential-based authentication. Over time, the users of this service changes, and for convenience considerations, a single credential is often used. The service is now accessed from multiple locations, different devices and for different purposes. It takes just one clumsy user to fall victim to one {fill in the credential harvesting technique of your choice}, to compromise this service and any following user of that service.
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The 2015 Layer 123 SDN & OpenFlow World Congress will be available live on Monday October 13th and Tuesday October 14th. Watch the live stream of the event for free on SDxCentral.
ClearPath leverages HP's virtual network functions (VNFs) together with its own vCPE technology to target service providers.