1. Data center networking services include,

   • ADC or SLB (Server load balancers)

     Application Delivery Controller is a network component that manages and optimizes how client machines connect to web and enterprise applications.

   • Advanced routers
   • Firewall
   • Intrusion prevention system
   • WAN acceleration

2. Enhancements of vPath over service insertion methods such as VLAN manipulation, PBR (Policy Based Routing) and WCCP (Web Cache Control Protocol),

   

   • Performance,
   • Service chains
   • Policy based forwarding
   • Traffic offload

3. Differences between VSG and ASAv?

   Virtual Security Gateway

   Adaptive Security Virtual Appliance

   • VSG policies can be executed inside the hypervisor kernel
   • ASAv must analyze every packet from a connection

4. CSR 1000V runs on IOS XE network operating system.

5. Advantages of using ADCs (Advanced delivery controllers)

   • Acceleration
   • Content switching
   • High availability
   • Scaling

6. Required configuration elements when deploying server load balancing in Citrix NetScaler 1000V,

   • Virtual IP address,
   • Monitor,
   • Servers

7. The following are WAN acceleration algorithms/methods available on vWAAS,

   • Windows printing AO (Application optimization)
   • DRE (Data Redundancy Elimination)
   • PLZ (Persistent Lempel-Ziv)
   • TFO (TCP Flow Optimization)

NOTE - TFC is not.

1. Following virtual networking services support vPath (Virtual data path),

   • VSG
   • vWAAS
   • NetScaler 1000V

2. Following solutions are components of Cisco Virtual Application Cloud Segmentation,

   • Nexus 1000V,
   • PNSC,
   • UCS Director,
   • VSG,
   • CSR 1000V

3. Differences between three-tier and custom virtual application containers, Additional security zones

   

Server Load Balancer

Keywords,

• Monitors : SLB creates requests to check whether a service is available on a server. Example - a ICMP (Internet Control Message Protocol) or a Http GET request along with a database query.
• Virtual IP ( VIP ) : SLB internal IP address that is specifically used to receive end user connections. The Address is registered with DNS server to be advertised to end users.
• Stickiness table : Optional component that stores client information such as IP address, Http cookies etc.
• Load balancing algorithm : It is the configured method of user traffic distribution among the servers deploying the same application. Example of algorithms are round robin, least connections and hashing

An interesting analogy for an SLB would be an airport control tower, which must identify the main characteristics of a landing airplane (user connection) before deciding which runway (server) it can use. The control tower usually applies a predefined method (algorithm) to sequence the arriving planes and must already know (monitor) if a runway is in maintenance or not.