Juniper QFX5200 Switch : Multi-Chassis Link Aggregation (MC-LAG)

JunOS Software Version: 15.1X53-D237.1   Both Switches set chassis fpc 0 pic 0 port 30 speed 100g set chassis fpc 0 pic 0 port 31 speed 100g set chassis aggregated-devices ethernet device-count 128 set vlans VL-1 vlan-id 1 description “Default VLAN” set vlans VL-2 description “ICCP Peering Vlan” set vlans VL-2 vlan-id 2 set vlans […]

Juniper – JNCIS-ENT

Designed for experienced networking professionals with beginner to intermediate knowledge of routing and switching implementations in Junos, this written exam verifies the candidate’s basic understanding of routing and switching technologies and related platform configuration and troubleshooting skills. Prerequisite Certifications JNCIA-Junos Exam Objectives Recommended Training JUNOS Intermediate Routing (JIR) Lab Diagrams and Guide JUNOS Enterprise Switching […]

IPSEC Diffie-Hellman Groups

Diffie-Hellman Group Number Diffie-Hellman Group Name RFC Group 1 768-bit modulus MODP Group RFC 7296 Group 2 1024-bit modulus MODP Group RFC 7296 Group 5 1536-bit modulus MODP Group RFC 3526 Group 14 2048-bit modulus MODP Group RFC 3526 Group 15 3072-bit modulus MODP Group RFC 3526 Group 16 4096-bit modulus MODP Group RFC 3526 […]

The Life of a Packet – Lab Exercise

This lab exercise explores a Cisco device configured as a DNS server and the ARP cache of a network router. Lab Topology Lab Download All of our lab exercises use EVE-NG as the platform for the emulation server.  Download the below exercise file and import into your EVE-NG server as a project file. Cisco IOL […]

Cisco Device Functions – Lab Exercise

This lab explores the MAC address table on Cisco IOS switches and routing table on Cisco IOS routers. This lab is a guided walk through of Cisco device functions. You will explore the commands used here in much more detail as you go through the rest of the lab exercises. Lab Topology Lab Download All […]

Cisco ASA : Initial Device Setup

The Cisco ASA Family of security devices protects corporate networks and data centers of all sizes. It provides users with highly secure access to data and network resources – anytime, anywhere, using any device. Cisco ASA devices represent more than 15 years of proven firewall and network security engineering and leadership, with more than 1 […]

Cisco Interface Troubleshooting

Interpreting Output from a Cisco Interface Parameter Description runts A frame that is smaller than the medium’s minimum frame size (e.g. 64 Bytes on an Ethernet network) and has a bad CRC giants A frame that is larger than the medium’s maximum frame size (e.g. 1518 Bytes on a non-jumbo frame Ethernet network) and has […]

IPv4 ~ Subnetting Reference Guide (CIDR)

CIDR  Subnet Mask   Addresses  Wildcard /32 1 /31 2 /30 4 /29 8 /28 16 /27 32 /26 64 /25 128 /24 256 /23 512 /22 1,024 /21 2,048 /20 […]

OSI Networking Model

What is the OSI Model? The OSI (Open Systems Interconnection) Reference Model is a conceptual framework that describes the functions of a networking or telecommunication system. The model uses 7 defined layers to help give a visual description of what is going on with a particular networking system. This can help Network IT Professionals narrow […]

IP Subnetting – Minus 256 Technique

This presupposes a solid knowledge of binary and IP Addressing conventions. Rule 1 Remember that the first octet only ever designates the class of IP.  (ie. Class A, Class B or Class C) Rule 2 The first octet that contains a zero bit, is always the octet where the action occurs. — Calculation happens […]