Related Questions

What is the minimum number of wires required for sending data over a serial communications links?
A 2
B 1
C 4
D 3
E None of the above
Data link layer retransmits the damaged frames in most networks. If the probability of a frame's being damaged is p, what is the mean number of transmissions required to send a frame if acknowledgements are never lost.
A P I (K + 1)
B KIK (1 + F)
C 1/ (1 - F)
D K I (K - P)
E None of the above
In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is
A equal to sum of other two
B greater than sum of other two
C less than sum of other two
D none of the mentioned
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
A 3, 3, 1, 7
B 3, 2, 1, none
C 3, 2, 1, 7
D 3, 3, 2, none
E All of the above
একই পদার্থ ও ব্যাসার্ধের দুটি তারের দৈর্ঘ্যের অনুপাত 1:2 । যদি সমান বল দ্বারা তার দুটিকে টানা হয়, তাহলে তার দুটির বিকৃতির অনুপাত কত? (Two wires of same material and same radius have the ratio of length 1:2 . If you pull the wires with same force, what will be the ratio of their strains?)
A 1:2
B 4:1
C 2:1
D 1:4
When a new trunk link is configured on an IOS-based switch, which VLANs are allowed over the link?
A By default, all VLANs are allowed on the trunk.
B No VLAN's are allowed, you must configure each VLAN by hand.
C Only configured VLAN's are allowed on the link.
D Only extended VLAN's are allowed by default.
When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?
A Supplied by the CSU\/DSU
B By the far end router
C By the clock rate command
D By the Physical layer bits stream timing
What function does a serial interface perform in data communication?
A Converts serial data into audio signals
B Converts analog signals into digital signals
C Converts parallel data into a stream of bits
D Decodes incoming signals into computer data
E None of the above
When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in metres permitted in this null-modem connection?
A 80
B 100
C 30
D 150
E None of the above
Start and stop bits are used in serial communication for
A Error detection
B Error correction
C Synchronization
D Slowing down the communication

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