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

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.

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.