Which of the following is the port used by SMTP?
21
23
25
80
Correct Answer :
C. 25
Related Questions
In an authentication using symmetric keys, if 10 people need to communicate, we need _______ keys.
90
10
20
45
Which of the following SIP request terminates a call?
ACK
BYE
INVITE
CANCEL
Which of the following is currently a de facto standard, commonly used for point-to-point
serial connections running TCP/IP?
Fiber Distributed Data Interface (FDDI)
Serial Line IP (SLIP)
Point-to-Point Protocol (PPP)
IEEE 802.3
Data Transmission is not a layer in the OSI model
True.
False.
Which of the following can be used to transfer files from a Unix server?
FTP
Telnet
IPX
Netstat
Which of the following protocols use a topology table to install routes into the IP routing
table?
Open Shortest Path First (OSPF)
Enhanced Interior Gateway Routing Protocol (EIGRP)
Exterior Gateway Protocol (EGP)
Static routing protocols
----------------is a static algorithm in which every incoming packet is sent out on every outgoing line except the one it arrives on.
Distance vector
Congestion
Link state routing
Flooding
Strings enclosed in _______ quotation marks indicate single tokens.
Alphanumeric
Morse code
ASCII
Binary
Which of these is an example for unguided transmission?
coaxial cable
optical fibers
wireless
twisted pairs
Which of the following defines a family of standards for 100 Mbps fiber optic LANs that
provides the physical layer and media access control sub-layer of the data link layer, as
defined by the ISO/OSI Model?
Ethernet
IEEE 802
Fiber Distributed Data Interface (FDDI)
Point-to-Point Protocol (PPP)
_______ Domain name corresponds to US military.
.us mili
.mili
.mil
.us
127.0.0.1 address is reserved for internal loopback functions.
True.
False.
25 is used by SMTP
True.
False.
Which type of connector is used on 10Base2 networks?
SC
BNC
RJ-45
RJ-11
Select the standard for token ring using token-passing media access.
802.2
802.3
802.5
802.11(b)
Your Web server is also configured as an FTP server. What part of the data packet will tell the server which application the data is meant for?
Port
IP address
MAC address
Frame header
________is a multicast extension to OSPF Version 2.
Multicast Source Discovery Protocol (MSDP)
Distance Vector Multicast Routing Protocol (DVMRP)
Multicast OSPF (MOSPF)
Internet Group Management Protocol (IGMP)
A financial institution that issues the card to the purchaser is ________.
Merchant
Issuer
Acquirer payment gateway
Cardholder
Which of the following is used for establishing, configuring, and testing the data-link
Link Control Protocol (LCP)
Method
Network Control Protocols (NCPs)
Link Control Protocol (LCP)
File transfer protocol(FTP)
Which of the following is the port used by SMTP?
21
23
25
80
How many 64-Kbps channels are used on an ISDN BRI?
1
2
3
4
What is the maximum length of twisted-pair cable before a signal booster is needed? Select all that apply.
25 meters
100 meters
328 feet
1000 feet
Which of the following fields holds the packets of several protocols?
NLPID field
Pad field
UI (0x03) field
Q.922 field
UDP datagram has a header, which is of ________.
16 bytes
8-bytes
32 bytes
64 bytes
Internet Architecture Board (IAB) governs which of the following bodies?
Internet Assigned Number Authority (IANA)
Internet Research Task Force (IRTF)
Internet Engineering Task Force (IETF)
All of the above
FTP servers by default listen on port ________ for incoming connections from FTP clients.
20
21
23
25
In which of the following states after selecting a mailbox, actions can be taken against the
mail within the mailbox?
Non-authenticated state
Authenticated state
Selected state
Logout state
--------------- is/are used for error detection.
Parity bit
checksum
both A) and B)
neither A) nor B).
In 1996, 36.44% of _________ addresses were brought in use.
Class A
Class D
Class B
Class C
What is the range of multicast addressing?
223.0.0.0 through 240.255.255.255
244.0.0.0 through 239.255.255.266
224.1.1.1 through 239.555.255.255
224.0.0.0 through 239.255.255.255