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

What does 802.3 have instead of "type" filed (as in 802.2) ? a. a "frame-type" filed b. a "IP" field c. a "length" field d. a "TTL" field

1 Answers  

---

At which TCP/IP layer does arp work ?

1 Answers  

---

what is MBR and how will u clear this ?

2 Answers  

---

what is VPN ?

4 Answers  

---

Which command will display the entire RAP table ?

1 Answers  

---

why we r going to freezing service group and system, what are the freezing steps & how to freezing service group?

0 Answers  

---

2 examples of DCE devices ? a. modems b. routers c. computers d. interface cards

1 Answers  

---

True or False: Twisted pair cabling comes in various versions and can support up to 96 ports and transmission speeds of 100 Mbps.

1 Answers  

---

First 4 bits of Class E IP address = ? a. 0001 b. 1100 c. 1110 d. 1111

1 Answers  

---

You have a class C subnet. You would like divide it up into 8 more subnets by "subnetting" ? What would be the subnet mask ? a. 255.255.255.192 b. 255.255.255.224 c. 255.255.255.240 d. 255.255.255.248 d. 255.255.255.252

1 Answers  

---

Which is the startup script for rpc ?

1 Answers  

---

Which command will extract all server1 packets from the /home/adm/packets and write them to the file /home/adm/ps2 ?

1 Answers  

---