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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Assurance | 10% | - Performance and fault management - Monitoring and logging
|
| Topic 2: Infrastructure | 30% | - IP services
- Layer 3 routing protocols
|
| Topic 3: Virtualization | 10% | - Network function virtualization (NFV) - Path isolation and segmentation - Device virtualization
|
| Topic 4: Security | 20% | - Secure access and segmentation
- Wireless security
|
| Topic 5: Automation | 15% | - Programmability concepts
- Automation tools
|
| Topic 6: Architecture | 15% | - Enterprise network design principles
- Wireless architecture |
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NEW QUESTION # 339
Refer to me exhibit.
Refer to the exhibit. A network engineer must configure NETCONF. After creating the configuration, the engineer gets output from the command show line, but not from show running-config. Which command completes the configuration?
Answer: D
NEW QUESTION # 340
Refer to the exhibit.
You have just created a new VRF on PE3. You have enabled debug
ip bgp vpnv4 unicast updates on PE1, and you can see the route in the debug, but not in the BGP VPNv4 table. Which two statements are true? (Choose two)
Answer: A,B
Explanation:
Explanation
Because some PE routers might receive routing information they do not require, a basic requirement is to be able to filter the MP-iBGP updates at the ingress to the PE router so that the router does not need to keep this information in memory.
The Automatic Route Filtering feature fulfills this filtering requirement. This feature is available by default on all PE routers, and no additional configuration is necessary to enable it. Its function is to filter automatically VPN-IPv4 routes that contain a route target extended community that does not match any of the PE's configured VRFs. This effectively discards any unwanted VPN-IPv4 routes silently, thus reducing the amount of information that the PE has to store in memory -> Answer 'PE1 will reject the route due to automatic route filtering' is correct.
Reference: MPLS and VPN Architectures Book, Volume 1
The reason that PE1 dropped the route is there is no "route-target import 999:999" command on PE1 (so we see the "DENIED due to: extended community not supported" in the debug) so we need to type this command to accept this route -> Answer 'After you configure route-target import 999:999 for a VRF on PE1, the route will be accepted' is correct.
NEW QUESTION # 341
Which LISP component is required for a LISP site to communicate with a non-LISP site?
Answer: A
NEW QUESTION # 342
Which two GRE features are configured to prevent fragmentation? (Choose two.)
Answer: C,F
Explanation:
The IP protocol was designed for use on a wide variety of transmission links. Although the maximum length of an IP datagram is 65535, most transmission links enforce a smaller maximum packet length limit, called an MTU. The value of the MTU depends on the type of the transmission link. The design of IP accommodates MTU differences since it allows routers to fragment IP datagrams as necessary. The receiving station is responsible for the reassembly of the fragments back into the original full size IP datagram.
Fragmentation and Path Maximum Transmission Unit Discovery (PMTUD) is a standardized technique to determine the maximum transmission unit (MTU) size on the network path between two hosts, usually with the goal of avoiding IP fragmentation. PMTUD was originally intended for routers in IPv4. However, all modern operating systems use it on endpoints.
The TCP Maximum Segment Size (TCP MSS) defines the maximum amount of data that a host is willing to accept in a single TCP/IP datagram. This TCP/IP datagram might be fragmented at the IP layer. The MSS value is sent as a TCP header option only in TCP SYN segments. Each side of a TCP connection reports its MSS value to the other side. Contrary to popular belief, the MSS value is not negotiated between hosts. The sending host is required to limit the size of data in a single TCP segment to a value less than or equal to the MSS reported by the receiving host.
TCP MSS takes care of fragmentation at the two endpoints of a TCP connection, but it does not handle the case where there is a smaller MTU link in the middle between these two endpoints.
PMTUD was developed in order to avoid fragmentation in the path between the endpoints. It is used to dynamically determine the lowest MTU along the path from a packet's source to its destination.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation- gre/25885-pmtud-ipfrag.html (there is some examples of how TCP MSS avoids IP Fragmentation in this link but it is too long so if you want to read please visit this link) Note: IP fragmentation involves breaking a datagram into a number of pieces that can be reassembled later.
If the DF bit is set to clear, routers can fragment packets regardless of the original DF bit setting
-> Answer D is not correct.
NEW QUESTION # 343
An engineer measures the Wi-Fi coverage at a customer site. The RSSI values are recorded as follows:
Which two statements does the engineer use to explain these values to the customer? (Choose two)
Answer: B,C
Explanation:
Reference:
Understanding Signal Strength
The most accurate way to express it is with milliwatts (mW), but you end up with tons of decimal places due to WiFi's super-low transmit power, making it difficult to read. For example, -40 dBm is 0.0001 mW, and the zeros just get more intense the more the signal strength drops.
Ultimately, the easiest and most consistent way to express signal strength is with dBm, which stands for decibels relative to a milliwatt.
You can convert between mW and dBm using the following formulas:
P(dBm) = 10 * log10(P(mW))
For example, a power of 2.5 mW in dBm is:
dBm = 10log2.5 = 3.979
dBm is that we're working in negatives. -30 is a higher (stronger) signal than -80.
Signal Strength
Rating
Required for
-30 dBm
Amazing
Max achievable signal strength. The client can only be a few feet from the AP to achieve this. Not typical or desirable in the real world.
N/A
-67 dBm
Very Good
Minimum signal strength for applications that require very reliable, timely delivery of data packets.
VoIP/VoWiFi, streaming video
-70 dBm
Okay
Minimum signal strength for reliable packet delivery.
Email, web
-80 dBm
Not Good
Minimum signal strength for basic connectivity. Packet delivery may be unreliable.
N/A
-90 dBm
Unusable
Approaching or drowning in the noise floor. Any functionality is highly unlikely.
N/A
3 dB of gain = +3 dB = doubles signal strength (Let's say, the base is P. So 10*log10(P/P)= 0 dB and 10*log10(2P/P) = 10*log10(2) = 3dB -> double signal)
3 dB of loss = -3 dB = halves signal strength strength (10*log(1/2) = -3.0103)
10 dB of loss = -10 dB = 10 times less signal strength (0.1 mW = -10 dBm, 0.01 mW = -20 dBm, etc.)
10 dB of gain = +10 dB = 10 times more signal strength (0.00001 mW = -50 dBm, 0.0001 mW = -40 dBm, etc.)
Simple rule of thumb:
When working with power, 3 dB means double (twice) the factor and 10 dB means 10-fold.
NEW QUESTION # 344
......
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