Answer / shikha dixit

There are various differences between X.25 and Frame Relay.
The most significant are:

1. Call Control

X.25 connection establishment and release (call control)
use in-band signaling within the same virtual channel used
for user data transmission causing additional overhead.
Frame Relay call control uses separate virtual channels
identified by reserved DLCI using the LMI (Local Management
Interface) protocol.

2. Routing vs. Switching

X.25 performs packet switching on OSI layer 3 (network
layer); Frame Relay performs packet switching on OSI layer
2 (data-link). Frame Relay does not use any layer 3
protocol.

3. Flow Control

Frame Relay (FR) doesn't perform flow control between frame
handlers (FR routers). X.25 routers have to acknowledge
each frame; in case of frame errors frames have to be
retransmitted and acknowledged. Frame Relay relies on flow
control performed by higher layer protocols

Which subdirectory of /usr/lib/mail contains the configuration files for sendmail ?

1 Answers  

---

What does the /var/named/named.root file specify ?

1 Answers  

---

what command to restore if the boot block is corrupted in linux

1 Answers   TCS,

---

hi , I m Ajay . i'v done my Bsc in 1997. my age 35 yrs . i'v working knowledge in computer maintinance and installation . it is possible to get job in call center as technical support or system management in companies . i'v also done redhat enterprise linux 4. (RHEL4) course.

4 Answers  

---

what is Cisco Firewall

2 Answers   Infosys,

---

What is a MAC ? a. It is the network layer address of a NIC that can not be modified b. It is the network layer address of a NIC that can be modified c. It is the Data Link Layer address of a NIC that can not be modified d. It is the Data Link Layer address of a NIC that can be modified

1 Answers  

---

How to set Proxy Setting?

6 Answers   TCS,

---

how many types of network connectivity's are their

2 Answers  

---

What is the subnet for a class C network ?

13 Answers   cDot,

---

Describe profile in terms of networking concept?

0 Answers  

---

What is called a set of physically connected computers in relatively small physical area.

1 Answers  

---

You have a Solaris host that acts as the DNS server. Which process (daemon) must this Solaris host be running ? a. dnsd b. dns c. named d. nameserver -d

1 Answers  

---