Monday, 19 December 2016

100-101 Questions Answers

Question No: 28

Which parameter or parameters are used to calculate OSPF cost in Cisco routers?

A. Bandwidth
B. Bandwidth and Delay
C. Bandwidth, Delay, and MTU
D. Bandwidth, MTU, Reliability, Delay, and Load

Answer: A

Friday, 12 August 2016

100-101 Questions Answers

Question No: 27

How does a switch differ from a hub?

A. A switch does not induce any latency into the frame transfer time.
B. A switch tracks MAC addresses of directly-connected devices.
C. A switch operates at a lower, more efficient layer of the OSI model.
D. A switch decreases the number of broadcast domains.
E. A switch decreases the number of collision domains.

Answer : B

Wednesday, 27 July 2016

100-101 Questions Answers

Question No : 26

Which protocol uses a connection-oriented service to deliver files between end systems?

A. TFTP
B. DNS
C. FTP
D. SNMP
E. RIP

Answer : C

Monday, 11 July 2016

100-101 Questions Answers

Question: 20

Which statements accurately describe CDP? (Choose three.)

A. CDP is an IEEE standard protocol.
B. CDP is a Cisco proprietary protocol.
C. CDP is a datalink layer protocol.
D. CDP is a network layer protocol.
E. CDP can discover directly connected neighboring Cisco devices.
F. CDP can discover Cisco devices that are not directly connected.

Answer : BCE

Friday, 17 June 2016

100-101 Questions Answers

Question No : 24

An administrator must assign static IP addresses to the servers in a network. For network 192.168.20.24/29, the router is assigned the first usable host address while the sales server is given the last usable host address. Which of the following should be entered into the IP properties box for the sales server?

A. IP address: 192.168.20.14
Subnet Mask: 255.255.255.248
Default Gateway: 192.168.20.9
B. IP address: 192.168.20.254
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.20.1
C. IP address: 192.168.20.30
Subnet Mask: 255.255.255.248
Default Gateway: 192.168.20.25
D. IP address: 192.168.20.30
Subnet Mask: 255.255.255.240
Default Gateway: 192.168.20.17
E. IP address: 192.168.20.30
Subnet Mask: 255.255.255.240
Default Gateway: 192.168.20.25

Answer: C

Friday, 20 May 2016

100-101 Questions Answers

Question No: 23

Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt required?

A. HTTP
B. IP
C. TCP
D. Telnet
E. UDP

Answer: E

Explanation/Reference:


UDP provides a connectionless datagram service that offers best-effort delivery, which means that UDP does not guarantee delivery or verify sequencing for any datagrams. A source host that needs reliable communication must use either TCP or a program that provides its own sequencing and acknowledgment services.

Friday, 6 May 2016

100-101 Questions Answers

Question: 22

Which two statements describe the operation of the CSMA/CD access method? (Choose two.)

A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
C. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.
D. After a collision, the station that detected the collision has first priority to resend the lost data.
E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.
F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.

Answer: B,E

Explanation
Explanation/Reference:

CSMA/CD stands for Carrier Sense Multiple Access with Collision Detection. In an Ethernet LAN, before transmitting, a computer first listens to the network media.

If the media is idle, the computer sends its data. If the media is not idle (another station is talking), the computer must wait for some time.

When a station transmits, the signal is referred to as a carrier. Carrier Sense means that before a station can send data onto an Ethernet wire, it have to listen to see if another “carrier” (of another station) is present. If another station is talking, this station will wait until there is no carrier present.

Multiple Access means that stations can access the network at any time. It is opposed to Token-Ring network where a station must have the “token” so that it can send data.

Although Carrier Sense help two stations not send data at the same time but sometimes two stations still send data at the same time! This is because two stations listen for network traffic, hear none, and transmit simultaneously . a collision occurs and both stations must retransmit at some later time. Collision Detection is the ability of the media to detect collisions to know that they must retransmit.

Basically, the CSMA/CD algorithm can be summarized as follows:

  • A device that wants to send a frame must wait until the LAN is silent (no one is “talking”)
  • If a collision still occurs, the devices that caused the collision wait a random amount of time and then try to send data again.

Friday, 8 April 2016

100-101 Questions Answers

Question: 22

What are two recommended ways of protecting network device configuration files from outside network security threats? (Choose two.)

A. Allow unrestricted access to the console or VTY ports.
B. Use a firewall to restrict access from the outside to the network devices.
C. Always use Telnet to access the device command line because its data is automatically encrypted.
D. Use SSH or another encrypted and authenticated transport to access device configurations.
E. Prevent the loss of passwords by disabling password encryption.

Correct Answer: BD

Thursday, 31 March 2016

100-101 Questions Answers

Question: 21

Which statements are true regarding ICMP packets? (Choose two.)

A. They acknowledge receipt of TCP segments.
B. They guarantee datagram delivery.
C. TRACERT uses ICMP packets.
D. They are encapsulated within IP datagrams.
E. They are encapsulated within UDP datagrams.

Correct Answer: CD
Explanation:
Ping may be used to find out whether the local machines are connected to the network or whether a remote site is reachable.
This tool is a common network tool for determining the network connectivity which uses ICMP protocol instead of TCP/IP and UDP/IP.
This protocol is usually associated with the network management tools which provide network information to network administrators, such as ping and traceroute
(the later also uses the UDP/IP protocol).
ICMP is quite different from the TCP/IP and UDP/IP protocols. No source and destination ports are included in its packets.
Therefore, usualpacket-filtering rules for TCP/IP and UDP/IP are not applicable.
Fortunately, a special "signature" known as the packet's Message type is included fordenoting the purposes of the ICMP packet.
Most commonly used message types are namely, 0, 3, 4, 5, 8, 11, and 12 which represent echo reply,destination unreachable, source quench, redirect, echo
request, time exceeded, and parameter problem respectively. In the ping service, after receivingthe ICMP "echo request" packet from the source location, the
destination

Friday, 4 March 2016

100-101 Questions Answers

Question: 20

Which OSI layer header contains the address of a destination host that is on another network?

A. application
B. session
C. transport
D. network
E. data link
F. physical

Correct Answer: D
Explanation:
Only network address contains this information. To transmit the packets the sender uses network address and datalink address. But the layer 2 address represents just the address of the next hop device on the way to the sender. It is changed on each hop. Network address remains the same.


Thursday, 3 March 2016

Cisco to acquire Leaba Semiconductor for $320 million as buying spree continues


Cisco continued its buying spree today as it announced its intention to acquire Israeli chip designer Leaba Semiconductor for $320 million.

Cisco sees this acquisition as a way to bolster its hardware catalog with highly advanced chip technology.

“By combining Leaba’s semiconductor expertise with the Cisco engineering team, we will accelerate our plans for Cisco’s next generation product portfolio and bring new capabilities to the market faster,” Rob Salvagno, head of Cisco’s M&A and venture investing team wrote in a blog post announcing the purchase.

When the deal closes, the Leaba team will report to Core Hardware Group, led by Cisco senior vice president, Ravi Cherukuri, according to the blog post.

The company actually doesn’t even have a shipping product yet, R Ray Wang, founder at Constellation Research told TechCrunch. “They haven’t even finished their prototype. This is an acqui-hire for next generation semi-conductor [technology]. Think networking at the chip level,” he said.

This is not the first time the Leaba founding team has launched and sold a cutting edge chip production company, according to report in Globes, an Israeli business publication. The founding team, which consists of CEO Eyal Dagan and CTO Ofer Eini sold Dune Networks to Broadcom for $178 million in 2009.

Today’s news comes just the day after the company announced it was buying CliQr, a cloud hybrid services management platform for $260 million and just about a month after it bought Jasper Technologies for $1.4 billion.

Cisco is walking a fine transformational line here. On one hand, the purchase pattern suggests that the company is trying to pivot from its networking hardware roots to a business centered around services as the CliQr and Jasper Technologies would suggest.

Much like IBM, Cisco is looking to the future and trying to use its cash hoard to make strategic purchases to help speed up that transition.

At the same time, it’s not quite ready to give up completely on its hardware roots and purchasing a leading-edge semiconductor company suggests that it is still looking to a future where it can continue to lead in the networking hardware space.

Wednesday, 10 February 2016

100-101 Questions Answers

Question: 19

How does TCP differ from UDP? (Choose two.)

A. TCP provides best effort delivery.
B. TCP provides synchronized communication.
C. TCP segments are essentially datagrams.
D. TCP provides sequence numbering of packets.
E. TCP uses broadcast delivery.

Answer: BD

Explanation
Explanation/Reference:

Explanation:
TCP differs from UDP in the following ways:
TCP provides best effort delivery.
TCP provides synchronized communication.
TCP segments are essentially datagrams.
TCP provides sequence numbering of packets.
TCP uses broadcast delivery.

Cisco Q2 Constant Help Soothe IT Sector Companies Jittery


Behind the scenes, Cisco Systems (CSCO) did what he had to do in the last quarter, and made a little more profitable: reliable network equipment are provided and helped others estimate and communicate faster, even as before populations high-flying technology company crashed.

After Wednesday's close, Cisco made a profit and sales that beat analysts' expectations fiscal Q2, as well as its projected earnings and sales for the current quarter. The CEO of the company, however, acknowledged that things were a little uncertain.

While the first 10 weeks of the second quarter to 31 December were "entirely consistent with what we expected ... (in) the last three weeks (January 23), which saw customers just pause a bit ... see what happens, "said Cisco CEO Chuck Robbins earnings conference call with analysts the company. "The (Data Center) upgrade campus activities, we've seen customers say, 'Hey, our infrastructure is underway. That this (purchase) before seeing how we're ready to go."

Kelly Kramer CFO added: "Our policy is prudent to have expanded our range of three points (percent) range instead of two, because we see it more volatile.."

For the period ended January 23, Cisco said profits minus liability items per share increased 7.5% over the same quarter last year to 57 cents less sections, while revenue fell 1% to $ 11.8 $ trillion. Excluding last year's performance of a set-top box TV company Cisco recently sold, revenues increased 2%.

Analysts polled by Thomson Reuters expected 54 cents to $ 11.75 billion. A year earlier, the former elements of Cisco EPS grew 13% to 53 cents, and sales increased 7% to $ 11.94 billion.

Cisco completed the sale of its set-top box Technicolor on November 20, to $ 600 million. Excluding that business, Cisco had guided adjusted Q2 EPS to 53-55 cents, on revenue growth of flat to 2%.

For fiscal Q3, Cisco led EPS ex items of 54 cents to 56 cents and an annual increase in revenue of 1% to 4%. Analysts had modeled 54 cents and a decrease of 0.8%.

Cisco is the No. 1 manufacturer of rarely seen but is used increasingly, high-speed switches, routers and other network equipment behind most of the telecommunications and internet service provider, helping lead many data center operations to cloud computing Internet a lot.

Cisco stock was up 9% in after-hours trading, after the company released its results.

In ordinary session on Wednesday, shares fell 0.6% to 22.51, 25% off up to eight of 30.31, set last March.

His rival Juniper Networks (JNPR) rose 1.5% after hours, after falling 1.7% to $ 21.62 in regular session on Wednesday.

latest results from Cisco helped the outlook for technology stocks information that crashed last week after Tableau software analysis software manufacturer's data (DATA) and the company's social media LinkedIn (LNKD) has given disappointing guidance. While fears of a slowdown in the global economy have increased, so did concerns of slower spending.

analysis firm Splunk (SPLK), security vendor Palo Alto Networks (PANW) and leading cloud software Salesforce.com (CRM) were among the shares fell sharply last week, although the latter two have recovered slightly this week. Splunk and Palo Alto were a fraction after hours of Wednesday, but the table and dropped a fraction Salesforce.

Cisco: Challenging Macro Environment

"We have delivered a strong Q2 and manage the business extremely well in a challenging macro environment," Robbins said at the publication of the results of the company. "We manage the company on two fronts. We focus on strong execution continues in the short term, while investing in innovation to bring our customers in the future."

As for the sale of its business set-top box, Cisco has been driven sectors of low growth, while acquisitions in the rapidly growing field. Last week, Cisco announced its agreement to acquire Jasper Technologies, which provides platform services in the Internet cloud objects (IO) for $ 1.4 billion. The transaction is expected to close during the fiscal quarter. Last quarter the company also completed the purchase of Rake, an operation of digital security; Lancope, firm safety analysis; ParStream, another specialist in the analysis; Mainstream and one a low-demand streaming company. In the call, Cisco executives said they recently completed the acquisition of Acano to help accelerate the collaborative approach of Cisco to deliver video more broadly.

In November, Cisco has entered into a "strategic partnership" with Ericsson (ERIC), the two companies say their sales will improve in the second half of the year. Robbins told analysts that Cisco and Ericsson "began to enter transactions together. I did not take it to the numbers that we are today. ... We are at the stage of the handle to the present, we see that acceleration".

"We have delivered a strong Q2 and manage the business extremely well in a challenging macro environment," said Cisco CEO Chuck Robbins in the publication of the results. "We manage the company on two fronts. We focus on execution continues strong in the short term, while investing in innovation to bring our customers in the future."

Tuesday, 2 February 2016

How To Pass 100-101 CCNA Interconnecting Cisco Networking Devices 1 (ICND1)

Cisco CCENT ICND1 100-101 Complete Video Course: Full Mesh Topology



100-101 Question Answer:

A network device needs to be installed in the place of the icon labeled Network Device to accommodate a leased line attachment to the Internet. Which network device and interface configuration meets the minimum requirements for this installation?

A. a router with two Ethernet interfaces
B. a switch with two Ethernet interfaces
C. a router with one Ethernet and one serial interface
D. a switch with one Ethernet and one serial interface
E. a router with one Ethernet and one modem interface

Answer: C

A Plus, A Call Option To Know About Cisco Systems


Consistently, one of the values ​​of the most popular people get wishlist canal stock options to stock options is Cisco Systems, Inc. (Symbol: CSCO). This week we highlight interesting contract sale and purchase contract interesting, since late October for CSCO. The sales contract of our algorithm YieldBoost identified as particularly interesting is the exercise of $ 18, which has a buyer at the time of writing 57 cents. This premium collection offers a yield of 3.2% compared with the commitment of $ 18, an annualized return of 4.4% (in the canal stock options YieldBoost call).

The sale of a sale not give a investor access to CISCO possible actions upward with the way it would, because the provider of the sale of shares held just finished the stage in which the contract is exercised. So unless Cisco Systems, Inc. saw its shares drop 22.8% and the contract is exercised (resulting in a base cost of $ 17.43 per share before fees, subtracting $ 57 18 cents ) only increased the seller of the option is the premium collection at an annualized rate of 4.4% return.

To be considered, the figure is 4.4% annualized dividend actually exceeds the 3.6% annualized paid by Cisco Systems, Inc., based on the current price of $ 23.32. However, if an investor were to buy the shares at the current market price in order to receive the dividend is greater disadvantage because they expected to lose population of 22.81% at a price of $ 18 strike.

It is always important when considering dividends is that, in general, the amount of dividends are not always predictable and tend to follow the ups and downs of the profitability of each business. In the case of Cisco Systems, Inc., looking at the picture of the history of dividends for CSCO below can help in judging whether the most recent dividend is likely to continue, and in turn whether a reasonable expectation to expect a yield of 3.6% annualized dividend.

As for the other side of the option chain we highlight a purchase contract of particular interest to the end of October, for the shareholders of Cisco Systems, Inc. (ticker: CSCO) looking to increase revenue beyond the rate of return annualized 3.6% of the action. Selling covered call a strike of $ 26 and the payment of the premium based on the offer of 83 cents an additional performance annualized rate of 4.9% over the current price (which is what we call Channel Options YieldBoost), for a total annual rate of 8.6% in the scenario in which the action is not called on. Any rise above $ 26 is lost if the stock goes up there and called, but actions CSCO expected to increase 11.5% compared to current levels for that to happen, which means that in the scenario where the action is called, the shareholder has acquired a 15.1% yield at this level bargaining, as well as dividends received before the action was called.

The following table shows the twelve months of leaks commercial history of Cisco Systems, Inc., highlighting green when the exercise of $ 18 compared to this story and highlighting the strike of 26 $ red.

The chart above and the historical volatility of the stock, can be a useful guide in conjunction with fundamental analysis to determine whether the sale of the October issue put or call options highlighted in this article supply rate of return is a good reward for risk. We estimate the volatility of twelve months of Cisco Systems, Inc. (CSCO considering the historical percentage last 251 days of operation using the price of the closing values ​​and the current price of $ 23.32) to 24%.

In the business of Monday afternoon, the sales volume of 500 components of S & P was 995,820 contracts with call volume to 1.18 m, for a put option: rate now 0.84 call for day, which is abnormally high relative to the average of long-term sales: call ratio 0.65. In other words, there are many more sale than there are buyers in options trading to date is normally considered compared to call buyers. Find out what options and 15 dealers who talk about today.

Tuesday, 19 January 2016

100-101 Questions Answers

QUESTION NO : 18

A switch has 48 ports and 4 VLANs. How many collision and broadcast domains exist on
the switch (collision, broadcast)?

A. 4, 48
B. 48, 4
C. 48, 1
D. 1, 48
E. 4, 1

Answer: B

Wednesday, 13 January 2016

100-101 Questions Answers

QUESTION NO : 17

Which OSI layer header contains the address of a destination host that is on another
network?

A. application
B. session
C. transport
D. network
E. data link
F. physical


Answer: D