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1500 questions
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3 answers

What is the difference between line cards and fabric cards in a CISCO NCS 6000?

I was reading the site preparation guide for the Cisco NCS 6000 Series routers and I saw this line: "The Cisco NCS 6000 Series Routers include the Cisco NCS 6008 Line Card Chassis (LCC) and the Cisco NCS 6000 Fabric Card Chassis (FCC)." Are those…
Nsikan
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Split OSPF Area 0 Behavior - What happens?

To make my question as simple as possible, I put together a quick scenario: Area 0 spans two data centers with multiple routers/networks in each. Area 0 has two ABR's connected to area 1 that connect to the same router in area 1. One area 0,1 ABR…
mdm
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Reliable connectivity to China

I have been struggling on getting reliable connectivity to China (AS4837 China Unicom Backbone, AS4134 China Telecom Backbone, AS4538 China Education and Research Network Center) On most links I have used I see 300ms+ RTT with high jitter and 50%…
sdaffa23fdsf
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Do LACP MTUs (or other link-level MTUs) need to match?

Does setting a custom MTU on the host side of a LACP bond require also customizing the MTU on the switch side?
willWorkForCookies
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Is CoS supported in a logical system?

This reference states that class of service is supported in a logical system, but another reference disagrees. This may be a disparity between versions, but I have notoiced there is no class of service stanza in a logical system on 12.3. Does the…
Dennis Olvany
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7
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3 answers

How to know at what OSI Layer(s) does a firewall operate

I understand that Firewalls may operate on different OSI layers depends on the firewall itself. but how can I know if I install specific firewall at what OSI Layer(s) it does operate ?
basma
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2 answers

"transport input" for AUX port in Cisco routers

On physical layer AUX port works on asynchronous serial RS-232 protocol. However, one can specify various application layer protocols like telnet or SSH as allowed input protocols under AUX line configuration. Am I correct that those protocols are…
Martin
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7
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3 answers

Routing traffic between two subnets

I currently admin a small network, it has two separate sites (site1 site2). Each site has independent internet, and a Sonic NSA 220 Firewall. There is currently VPN connecting the two Sonic firewalls, so the sites can communicate without any…
Imagine That
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2 answers

Source NATing Fortigate typical scenario

I have a small query with respect to NATing in Fortigate.I'm struck in particular by a scenario where the remote network allows users with a specific IP range with a specific port for RDP over a different set of physical links.…
Faizan Nizam
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How do interfaces behave in a single-ended LACP configuration?

Situation: two ethernet connections, between a switch and a server. At the switch end, the two interfaces are configured for LACP. At the server end, they're configured as normal ethernet interfaces. How do the switch interfaces behave? I believe…
fixit9660
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1 answer

BGP authentication-key-chain vs. authentication-key

I found a neat little behavior on a Juniper box I was working with today. We were migrating from a Cisco ASR to an MX and all of our internet exchange peers that had authentication configured didn't come up. We received log messages on the MX480…
Jordan Head
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3 answers

Difference between trunk and access/voice port

Is there a difference between the following two configurations on a cisco device? int g0/1 switchport mode access switchport access vlan 10 switchport voice vlan 20 and int g0/1 switchport trunk encapsulation dot1q switchport mode trunk switchport…
koron54
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5 answers

traceroute doesn't print entire route sometimes

Monitoring my network I realized some time ago that traceroute used to print routes more complete than it is doing right now... and, right now, sometimes traceroute omits some devices. For example, this is a more complete traceroute, including my…
Leandros López
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7
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How do the Application, Presentation and Session layers of the OSI model map to TCP/IP's Application Layer and vice versa?

I need to map TCP/IP protocols to the OSI model for some university test revision I am doing. I was wondering if it is generally acceptable to assume any OSI Level 7, 6 and 5 protocol will be transferred directly into TCP/IP's Layer 4 (Application…
Michael Morgan
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4 answers

Website filtering via IOS

Our office network uses the 1921/K9 router along with SG300 L3 switch (and a few other L2 switches) all with base modules. If we wanted to block employees from visiting certain websites, what would be the best way to do it with the current…
lamp_scaler
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