Network Administration & Consulting Services

What are the standard port numbers for SMTP, POP3, IMAP4, RPC, LDAP and Global Catalog?

Posted Wednesday, 19 September 2007 by Michael Khanin
SMTP – 25, POP3 – 110, IMAP4 – 143, RPC – 135, LDAP – 389, Global Catalog - 3268

What is a default gateway?

Posted Wednesday, 19 September 2007 by Michael Khanin
The exit-point from one network and entry-way into another network, often the router of the network.

How do you set a default route on an Cisco router?

Posted Wednesday, 19 September 2007 by Michael Khanin
ip route 0.0.0.0 0.0.0.0 x.x.x.x [where x.x.x.x represents the destination address]

Describe the lease process of the DHCP server.

Posted Saturday, 27 October 2007 by Michael Khanin

DHCP Server leases the IP addresses to the clients as follows:

DORA
D (Discover) : DHCP Client sends a broadcast packets to identify the dhcp server, this packet will contain the source MAC.
O (Offer) : Once the packet is received by the DHCP server, the server will send the packet containing Source IP and Source MAC.
R (Request) : Client will now contact the DHCP server directly and request for the IP address.
A (Acknowledge) : DHCP server will send an ack packet which contains the IP address.

What is IPv6?

Posted Saturday, 27 October 2007 by Michael Khanin

Internet Protocol version 6 (IPv6) is a network layer IP standard used by electronic devices to exchange data across a packet-switched internetwork. It follows IPv4 as the second version of the Internet Protocol to be formally adopted for general use.  ip v6 it is a 128 bit size address. This is total 8 octants each octant size is 16 bits separated with “:”, it is in hexa decimal format. These 3 types:

1. unicast address
2. multicast address
3. anycast address

loopback address of ip v6 is ::1