PORT NUMBERS

21 FTP
22 SSH
23 TELNET
25 SMTP
53 DNS
67 DHCP
110 POP3
443 SSL ( HTTPS)
161/162 SNMP
3389 RDP
9  IGRP
88 EIGRP
89 OSPF
179 BGP
520 RIP

IP SUBNETTING

/24 - 2>8 - 255.255.255.0       
/25 - 2>7 - 255.255.255.128
/26 - 2>6 - 255.255.255.192
/27 - 2>5 -255.255.255.224
/28 - 2>4 - 255.255.255.240
/29 - 2>3 - 255.255.255.248
/30 - 2>2 - 255.255.255.252
/31 -2>1- 255.255.255.254


Class A - 0 - 126 -- 10.0.0.0 - 10.255.255.255
Class B - 128 -191 -- 172.16.0.0 - 172.31.255.255
Class C - 192 - 223 -- 192.168.0.0 - 192.168.255.255
Class D - 224 - 239 224.0.0.0 -  Mulicast
Class E - 240 -254 research 


1.)

192.168.10.0/27 

255.255.255.224

How many networks - 224/(2^5) = 7

Network address 192.168.10.0
Broadcast address 192.168.10.31
Hosts 192.168.10.1 - 192.168.10.30
How many hosts per network - 30 (32-2)

192.168.10.0
192.168.10.32
192.168.10.64
192.168.10.96
192.168.10.128
192.168.10.160
192.168.10.192
192.168.10.224

2.)


192.168.10.0/28

255.255.255.240

How many networks - 240/ ( 2^4) = 15

Network address 192.168.10.0
Broadcast adddress 192.168.10.15
Hosts 192.168.10.1 - 192.168.10.14
How many hosts per network - 14 (16-2)

192.168.10.0
192.168.10.16
192.168.10.32
192.168.10.48
192.168.10.64
192.168.10.80
192.168.10.96
192.168.10.112
192.168.10.128
192.168.10.144
192.168.10.160
192.168.10.176
192.168.10.192
192.168.10.208
192.168.10.224
192.168.10.240

CCIE

CCIE number starts from 1025.

INTERVIEW QUESTIONS

TCS 

17/3/2012

Primary Skill :-
Network Engineer(4+ yrs)
Network, LAN, WAN, Routing, Switching,Troubleshooting,Cisco Experience

Ques.

1. BGP - Command to check routes advertised
2. Load sharing
3. what is Sup engine , purpose of using sup engine 
4. Scenario : 10 Valns are there required , traffic should load balanced through ROUTER A and ROUTER B. What are steps needs to take.

 5. VTP - If new switch wants to add in  VTP, what and all required to be care of 










XL HEALTH

Experience                          : 3+yrs

·         Install, configure, and maintain network services, equipment and devices.
·         Supports administration of servers and server clusters.
·         Manages all system back-up and restore protocol.
·         Plans and supports network and computing infrastructure.
·         Perform troubleshooting analysis of servers, workstations and associated systems.
·         Documents network problems and resolution for future reference.
·         Monitors system performance and implements performance tuning.
·         Manage user accounts, permissions, email, anti-virus, anti-spam.
·         Requires a thorough knowledge of networking essentials.
·         Oversee software and network security.
·         Strong analytical abilities and professional office experience needed.

Technical Skills:
·         Certifications: MCSE, CCNA
·         Systems: Windows, Cisco Systems,
·         Networking Switches, Routers, Hubs, Servers, Cables, Racks, Firewalls, LAN,WAN,TCP/IP,DNS,UDP, Latency, Volp

Ques.


1.Explain exchange 2003 to 2007 Migration






TECH MAHINDRA

18/3/2012

      Skills required are really fairly standard Cisco skills to CCNP level, but significant hands on experience would be a significant advantage. It’s basically a Branch network of some 100 or so sites, but of course they are all 3rd party sites. The main features used in the Extranet include:
·         IP Clear/MPLS connectivity
·         Some legacy Cellstream/Framestream
·         BGP, RIP and EIGRP routing protocols
·         Extensive use of GRE tunnels.
·         Extensive use of PBR
·         Some IPSEC
·         Some ISDN/ADSL
·         Hardware is mainly 2600, 2800, 3700 and 3800 routers plus 7200 and ASR1004s at the core.

    LAN skills are needed as there is a small LAN environment that BT manage. This is a L2 environment and not that complex, though knowledge of VLAN pruning would be desirable.
 Experience is BGP is must.
 CCNP is mandatory.

Ques.

1. VTP
If new switch has to add in VTP -- Then what and all required on config.
http://jklogic.net/adding-a-cisco-switch-to-a-vtp-domain/
http://ciscotips.wordpress.com/2006/05/23/connecting-a-new-switch/
2. BGP attributes
3. STP process
4. BPDU gurad
5. EIGRP STUCK IN ACTIVE




CSS

24/03/2012

Primary Skill:

* Good understanding of OSI Model, TCP/IP protocol suite (IP, ARP, ICMP, TCP, UDP, SNMP, FTP, TFTP)

And

* Strong knowledge in any of the following skill set

1. Windows or Linux or Citrix (ADS, DNS, DHCP)
2. VPN, Firewall, Checkpoint, Pix
3. RSA, PKI, Digital Certificate
4. IPSEC protocol suite, SSL based VPN, AAA


CTS
31/03/12
Q.
 1. SVI ( Switch Virtual Interface )
 2. IP Sec all states

SWITCHING

Layer 3 routing performed by microprocessor type engines. Which required CPU cycles to examine each packets network header.

In switching frames are forwarded using special hardware called application specific integrated circuits(ASIC).

Routing : Cisco express forwarding (CEF) a database of routes to every destination on the network. It will distributes the packets to ASICs. 

Each switch port has its own collision domain and do not send collisions to any other port.

VLAN routing required L3 device (router or l3 switch).

Network Traffic Model :-

80/20 Rule - 80% of the organization traffic will be in switching .
                   20% will be in routing.

Hierarchical network design :-  

Access Layer 
Distribution Layer
Core Layer

VLAN ( Virtual Local Area Network)

VLAN - IEEE 802.1q 

 

STP ( Spanning Tree Protocol)

IEEE 802.1D - STP

Rapid STP - IEEE 802.1w

First to elect root bridge
  Slowest priority will be the root bridge.Bridges have same priority then smallest mac address will be the root bridge.

STP will temporally blocks the redundant paths.

PVST+ (Per Vlan Spanning Tree) - Each vlan will elect a root switch. Each vlan have its own instance.


To elect the root bridge flood the BPDU (Bridge protocol data unit) and this contains Bridge id and sender id.



After electing root bridge.


Root port - Best path to reach root birdge/switch.
Designated port - Best path to the switched segment.
Alternate port- Backup for the root port.
Backup port - Backup of the Designated port

Port states of STP .

1. Blocking state - All the ports are in this while switch initialization , will listen to the network.
2.Listening state - Will listen the traffic, port is set to forward the frame. Default time of the state is 15secs.
3.Learning state - Will listen the traffic and begin to learn the addresses from connected devices on a segment.
4.Forwarding state - Will forward the traffic as well as continue to learn the addresses from the segment.

Default priority port is - 32768