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New Cisco 300-320 Exam Dumps Collection (Question 6 - Question 15)
Question No: 6
A network engineer must use an Internet connection to provide backup connectivity between two sites. The backup connection must be encrypted and support multicast. Which technology must be used?
A. GRE over IPsec
B. GETVPN
C. IPsec direct encapsulation
D. DMVPN
Answer: A
Question No: 7
Which of this is true of IP addressing with regard to VPN termination?
A. IGP routing protocols will update their routing tables over an IPsec VPN
B. Termination devices need routable addresses inside the VPN
C. Addressing design need to allow for summarization
D. Designs should not include overlapping address spaces between sites, since NAT is not supported
Answer: C
Explanation:
Best design practices say the VPN design should allow for summarization. With regards to D - sometimes you cannot avoid overlapping addresses as this is what is configured at client's end, and the only option is to hide the overlapping subnet behind NAT - based on experience (The author of this remark has 50x VPN tunnels and majority of them is using
NAT, even if the subnet doesn't overlap, we want to hide our real IPs behind something else - extra security)
Question No: 8
A network engineer designing an access layer that requires all uplinks to be active, furthermore, VLANs must span across the entire switch block. Which two design fulfill this requirement? (Choose two)
A. Layer 2 Flex Links
B. Layer 2 loop-free inverted U
C. Layer 2 loop square
D. Layer 2 loop-free U
Answer: B,C
Question No: 9
Which security mechanism can you implement to protect the OSPF" information that a router receives?
A. privilege 15 credentials
B. administrator username and password authentication
C. RADIUS authentication
D. cryptographic authentication
Answer: D
Question No: 10
What command essentially turns on auto summarization for EIGRP?
A. area 0 range 10.0.0.0 255.0.0.0.0
B. router eigrp 1
C. ip summary-address eigrp 1 10.0.0.0 255.0.0.0
D. ip summary-address 10.0.0.0 255.0.0.0
E. eigrp stub
Answer: C
Question No: 11
A network engineer must reduce the security risks on a BGP network. Which option helps to avoid rogue route injection, unwanted peering, and malicious BGP activities?
A. Apply route maps and policies in route redistribution events.
B. Apply MD5 authentication between all BGP peers.
C. Encrypt all traffic with IPsec between neighbors.
D. Use GRE tunnels between all BGP peers.
Answer: D
Question No: 12
Refer to the exhibit. An engineer must provide a redesign for the distribution and access layers of the network. Which correction allows for a more efficient design?
A. Change the link between Distribution Switch A and Distribution Switch B to be a routed link.
B. Reconfigure the Distribution Switch A to become the HSRP Active.
C. Create an EtherChannel link between Distribution Switch A and Distribution Switch B.
D. Add a link between Access Switch A and Access Switch B.
Answer: B
Question No: 13
An engineer is designing a network using RSTP. Several devices on the network support only legacy STP. Which outcome occurs?
A. RSTP and STP choose the protocol with the best performance.
B. RSTP and STP interoperate and fast convergence is achieved.
C. RSTP and STP are not compatible and legacy ports error disable.
D. RSTP and STP interoperate, but the fast convergence is not used.
Answer: D
Question No: 14
At which layer in the ACI fabric are policies enforced?
A. leaf
B. spine
C. APIC
D. endpoint
Answer: C
Question No: 15
You use 2x ISPs for the internet connectivity. How could you avoid your internal network to become a transit area (Choose two)?
A. accept all routes from ISPs inbound
B. advertise all routes outbound
C. filter internal routes inbound
D. filter internal routes outbound
E. use just one ISP
Answer: A,D
Explanation:
When connecting to multiple exit points from your AS and peering with multiple ISPs, there is a danger that by misconfiguration, you advertise routes that are received from one ISP to the other ISP. Your AS can become a transit area for Internet traffic of other networks, which can cost you money and resources. You can easily avoid this situation by advertising only your assigned address space to all
adjacent ISPs (also, you can advertise only your local AS and filter out the other ASs using BGP AS-path filter).
From a design point of view, this model (Multi-homing with Two ISPs) requires careful design consideration. For example, to avoid making the enterprise network as a transit AS/path for the two external ISPs (for example, ISP1 and ISP2), it is recommended that you always announce only your PI address space to the ISPs you are directly connected to. If, by mistake, you advertise routes that are received from ISP1 to ISP2, and ISP2u2021s policy is not restrictive enough, your AS will start to participate in the Internet traffic exchange (become a transit AS). In addition, if AS X, as shown in Figure 5-23, decided that the path to ISP1 from AS X is shorter through your network (via ISP2), it will start sending traffic that is destined for ISP1 to your router. Your router will happily route the traffic to ISP1, but the problem is that this extra traffic might leave your users with no bandwidth for themselves and, as a result, it will impact the overall user experience. Also, this situation raises a high security concern, because external traffic from an unknown network, traffic that could be malicious, will be using your corporate network as a transit path. Therefore, you, as the network designer, need to ensure that only the enterprise-owned PI address range is announced, combined with AS PATH filtering to permit only routes originating from the enterprise local AS to be advertised.
To prevent your network from becoming a transit AS, make sure that you advertise only your own PI address space to both ISPs by using outbound route filtering, BGP AS-PATH filtering, or a combination of both.
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