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NEW QUESTION: 1
Two directly connected routers, R1 and -R2, are both configured for OSPF graceful restart. R2 is able to switch packets in hardware, but R1 is not. If a network administrator logs on to R2 and performs a system reload, which will be the result?
A. All the traffic R2 is forwarding to or through R1 will be dropped while OSPF rebuilds its neighbor adjacency and forwarding tables.
B. R2 will continue forwarding traffic to and through R1, but R1 will drop this traffic because it is not capable of maintaining its forwarding state.
C. Traffic forwarded from R2 to or through -R1 will continue to be forwarded based on the forwarding table state at the time of the reload.
D. R2 will continue to forward traffic to -R1, but -R1 will drop the traffic because its neighbor adjacency with R2 has failed.
Answer: C
Explanation:
Graceful Restart Router Operation Graceful Restart Initiation The restarting router becomes aware that it should start the graceful restart process when the network administrator issues the appropriate command or when an RP reloads and forces and Redundancy Facility (RF) switchover. The length of the grace period can be set by the network administrator or calculated by the OSPF software of the restarting router. In order to prevent the LSAs from the restarting router from aging out, the grace period should not exceed an LSA refresh time of 1800 seconds. In preparation for graceful restart, the restarting router must perform the following action before its software can be reloaded: The restarting router must ensure that its forwarding table is updated and will remain in place during the restart. No OSPF shutdown procedures are performed since neighbor routers must act as if the restarting router is still in service. The OSPF software is reloaded on the router (it undergoes graceful restart).
OSPF Processes during Graceful Restart After the router has reloaded; it must modify its OSPF processes until it reestablishes full adjacencies with all former fully adjacent OSPF neighbors. During graceful restart, the restarting router modifies its OSPF processes in the following ways: The restarting router does not originate LSAs with LSA types 1, 5, or 7 so that the other routers in the OSPF domain will use the LSAs that the restarting router had originated prior to reloading. The router does not modify or flush any self-originated LSAs. The restarting router runs its OSPF routing calculations in order to return any OSPF virtual links to operation. However, the restarting router does not install OSPF routes into the system??s forwarding table, and the router relies on the forwarding entries that it had installed prior to undergoing the graceful restart process. If the restarting router determines that is was the Designated Router on a given segment prior to the graceful restart, it will reelect itself.
Graceful Restart Process Exit The restarting router exits the graceful restart process when one of the following events occurs: The router has reestablished all adjacencies. The graceful restart was successful. The router receives an LSA that is inconsistent with an LSA from the same router prior to the graceful restart. The inconsistency can mean either that the router does not support the graceful restart feature or that the router has terminated its helper mode for some reason. The graceful restart was unsuccessful. The grace period has expired.
The graceful restart was not successful. Once the restarting router has completed the graceful restart process, it returns to normal OSPF operation, reoriginating LSAs based on the current state of the router and updating its forwarding tables based on current link-state database contents. At this time, it flushes the grace-lsa's that it had originated during the initiation of the graceful restart process.
NEW QUESTION: 2
A company operates a group of imaging satellites. The satellites stream data to one of the company's ground stations where processing creates about 5 GB of images per minute. This data is added to network-attached storage, where 2 PB of data are already stored.
The company runs a website that allows its customers to access and purchase the images over the Internet. This website is also running in the ground station. Usage analysis shows that customers are most likely to access images that have been captured in the last 24 hours.
The company would like to migrate the image storage and distribution system to AWS to reduce costs and increase the number of customers that can be served.
Which AWS architecture and migration strategy will meet these requirements?
A. Create a 1-Gb Direct Connect connection from the ground station to AWS. Use the AWS Command Line Interface to copy the existing data and upload new data to Amazon S3 over the Direct Connect connection. Migrate the data distribution website to EC2 instances. By using Amazon S3 as an origin, have this website serve the data through CloudFront by creating signed URLs.
B. Use multiple AWS Snowball appliances to migrate the existing imagery to Amazon S3. Create a
1-Gb AWS Direct Connect connection from the ground station to AWS, and upload new data to Amazon S3 through the Direct Connect connection. Migrate the data distribution website to Amazon EC2 instances. By using Amazon S3 as an origin, have this website serve the data through Amazon CloudFront by creating signed URLs.
C. Use multiple Snowball appliances to migrate the existing images to an Amazon EFS file system.
Create a 1-Gb Direct Connect connection from the ground station to AWS, and upload new data by mounting the EFS file system over the Direct Connect connection. Migrate the data distribution website to EC2 instances. By using webservers in EC2 that mount the EFS file system as the origin, have this website serve the data through CloudFront by creating signed URLs.
D. Use multiple Snowball appliances to migrate the existing images to Amazon S3. Upload new data by regularly using Snowball appliances to upload data from the network-attached storage. Migrate the data distribution website to EC2 instances. By using Amazon S3 as an origin, have this website serve the data through CloudFront by creating signed URLs.
Answer: A
NEW QUESTION: 3
What is the result of issuing the frame-relay map ip 192.168.1.2 202 broadcast command?
A. defines the DLCI on which packets from the 192.168.1.2 IP address are received
B. defines the destination IP address that is used in all broadcast packets on DCLI 202
C. defines the DLCI that is used for all packets that are sent to the 192.168.1.2 IP address
D. defines the source IP address that is used in all broadcast packets on DCLI 202
Answer: C
Explanation:
Frame-relay map ip 192.168.1.2 202 command statically defines a mapping between a network layer address and a DLCI. The broadcast option allows multicast and broadcast packets to flow across the link.
The command frame-relay map ip 192.168.1.2 202 broadcast means to mapping the distal IP 192.168.1.2 202 to the local DLCI. When the "broadcast" keyword is included, it turns Frame Relay network as a broadcast network, which can forward broadcasts.
Reference:
http://www.cisco.com/en/US/docs/ios/wan/command/reference/wan_f2.html#wp1012264
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