Cisco認定資格は様々な重要な機能やタスクを実行することで、知識を広げ、スキルを深めることができます。300-101試験は、CCNP Routing and Switching認定に関連する試験であります。ROUTE 300-101は、ルーティングに関する知識とスキルを証明する試験です。
CCNP Routing and Switching認定を取得は300-101Implementing Cisco IP Routing (ROUTE v2.0 )受験以外に300-115 SWITCH Implementing Cisco IP Switched Networks (SWITCH v2.0 )と300-135 TSHOOT Troubleshooting and Maintaining Cisco IP Networks (TSHOOT v2.0 )を取得必要があります。
試験番号：300-101 ROUTE
試験名称：Implementing Cisco IP Switched Networks
対応資格：CCNP Routing and Switching
CCDP
試験時間：120 分
問題数：45 - 65 問
問題集の数：149
試験言語：日本語、英語
試験登録：Pearson VUE
300-101 ROUTE問題集は研究分野の専門家によって書かれて、試験合格できるのを保障します。300-101参考書は安全かつ効率的な取引体験をするだけでなく、より多くの知識を勉強することもできます。高品質な300-101受験対策は認定試験のためにお客様の一番望ましい選択です。
1.A network engineer notices that transmission rates of senders of TCP traffic sharply increase and
decrease simultaneously during periods of congestion.
Which condition causes this?
A. global synchronization
B. tail drop
C. random early detection
D. queue management algorithm
Answer: A
Explanation:
TCP global synchronization in computer networks can happen to TCP/IP flows during periods of
congestion because each sender will reduce their transmission rate at the same time when packet loss
occurs. Routers on the Internet normally have packet queues, to allow them to hold packets when the
network is busy, rather than discarding them.
Because routers have limited resources, the size of these queues is also limited. The simplest technique
to limit queue size is known as tail drop. The queue is allowed to fill to its maximum size, and then any
new packets are simply discarded, until there is space in the queue again. This causes problems when
used on TCP/IP routers handling multiple TCP streams, especially when bursty traffic is present. While
the network is stable, the queue is constantly full, and there are no problems except that the full queue
results in high latency. However, the introduction of a sudden burst of traffic may cause large numbers of
established, steady streams to lose packets simultaneously.
Reference: http://en.wikipedia.org/wiki/TCP_global_synchronization
2.Which three problems result from application mixing of UDP and TCP streams within a network with no
QoS? (Choose three.)
A. starvation
B. jitter
C. latency
D. windowing
E. lower throughput
Answer: A,C,E
Explanation:
It is a general best practice not to mix TCP-based traffic with UDP-based traffic (especially streaming
video) within a single service provider class due to the behaviors of these protocols during periods of
congestion. Specifically, TCP transmitters will throttle-back flows when drops have been detected.
Although some UDP applications have application-level windowing, flow control, and retransmission
capabilities, most UDP transmitters are completely oblivious to drops and thus never lower transmission
rates due to dropping. When TCP flows are combined with UDP flows in a single service provider class
and the class experiences congestion, then TCP flows will continually lower their rates, potentially giving
up their bandwidth to drop-oblivious UDP flows. This effect is called TCP-starvation/UDP-dominance. This
can increase latency and lower the overall throughput. TCP-starvation/UDP-dominance likely occurs if
(TCP-based) mission-critical data is assigned to the same service provider class as (UDP-based)
streaming video and the class experiences sustained congestion. Even if WRED is enabled on the
service provider class, the same behavior would be observed, as WRED (for the most part) only affects
TCP-based flows.
Granted, it is not always possible to separate TCP-based flows from UDP-based flows, but it is beneficial
to be aware of this behavior when making such application-mixing decisions.
Reference: http://www.cisco.com/warp/public/cc/so/neso/vpn/vpnsp/spqsd_wp.htm
3.Which method allows IPv4 and IPv6 to work together without requiring both to be used for a single
connection during the migration process?
A. dual-stack method
B. 6to4 tunneling
C. GRE tunneling
D. NAT-PT
Answer: A
Explanation:
Dual stack means that devices are able to run IPv4 and IPv6 in parallel. It allows hosts to simultaneously
reach IPv4 and IPv6 content, so it offers a very flexible coexistence strategy. For sessions that support
IPv6, IPv6 is used on a dual stack endpoint. If both endpoints support Ipv4 only, then IPv4 is used.
Benefits:
? Native dual stack does not require any tunneling mechanisms on internal networks
? Both IPv4 and IPv6 run independent of each other
? Dual stack supports gradual migration of endpoints, networks, and applications.
Reference: http://www.cisco.com/web/strategy/docs/gov/IPV6at_a_glance_c45-625859.pdf
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