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2021 Sep 400-101 ccie routing and switching written exam fee:
Q421. Which two statements are true about an EPL? (Choose two.)
A. It is a point-to-point Ethernet connection between a pair of NNIs.
B. It allows for service multiplexing.
C. It has a high degree of transparency.
D. The EPL service is also referred to as E-line.
Answer: C,D
Explanation:
Ethernet private line (EPL) and Ethernet virtual private line (EVPL) are carrier Ethernet data services defined by the Metro Ethernet Forum. EPL provides a point-to-point Ethernet virtual connection (EVC) between a pair of dedicated user–network interfaces (UNIs), with a high degree of transparency. EVPL provides a point-to-point or point-to-multipoint connection between a pair of UNIs. The services are categorized as an E-Line service type, with an expectation of low frame delay, frame delay variation and frame loss ratio. EPL is implemented using a point-to-point (EVC) with no Service Multiplexing at each UNI (physical interface), i.e., all service frames at the UNI are mapped to a single EVC (a.k.a. all-to-one bundling).
Reference: http://en.wikipedia.org/wiki/Ethernet_Private_Line
Q422. A TCP/IP host is able to transmit small amounts of data (typically less than 1500 bytes), but attempts to transmit larger amounts of data hang and then time out. What is the cause of this problem?
A. A link is flapping between two intermediate devices.
B. The processor of an intermediate router is averaging 90 percent utilization.
C. A port on the switch that is connected to the TCP/IP host is duplicating traffic and sending it to a port that has a sniffer attached.
D. There is a PMTUD failure in the network path.
Answer: D
Explanation:
Sometimes, over some IP paths, a TCP/IP node can send small amounts of data (typically less than 1500 bytes) with no difficulty, but transmission attempts with larger amounts of data hang, then time out. Often this is observed as a unidirectional problem in that large data transfers succeed in one direction but fail in the other direction. This problem is likely caused by the TCP MSS value, PMTUD failure, different LAN media types, or defective links.
Reference: http://www.cisco.com/c/en/us/support/docs/additional-legacy-protocols/ms-windows-networking/13709-38.html
Q423. Which two types of traffic are blocked when the storm control threshold for multicast traffic is reached on a port? (Choose two.)
A. BPDU
B. OSPF
C. CDP
D. IS-IS
E. LLDP
Answer: B,D
Q424. Refer to the exhibit.
How many LSDBs will router A have?
A. 0
B. 1
C. 2
D. 3
Answer: D
Q425. What are two reasons to use the ip ospf database filter all out command? (Choose two.)
A. to maintain a centralized OSPF database on a single master device
B. to avoid flooding LSAs on low-speed links
C. to ensure a consistent OSPF database across the network
D. to selectively filter OSPF routes without disrupting the SPF algorithm
E. to filter only type 7 LSAs from an OSPF area
F. to enable OSPF to send triggered updates
Answer: A,B
Leading 400-101 ccie routing and switching written exam fee:
Q426. How many hash buckets does Cisco Express Forwarding use for load balancing?
A. 8
B. 16
C. 24
D. 32
Answer: B
Explanation:
In order to understand how the load balance takes place, you must first see how the tables relate. The Cisco Express Forwarding table points to 16 hash buckets (load share table), which point to the adjacency table for parallel paths. Each packet to be switched is broken up into the source and destination address pair and checked against the loadshare table.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/18285-loadbal-cef.html
Q427. Which three factors does Cisco PfR use to calculate the best exit path? (Choose three.)
A. quality of service
B. packet size
C. delay
D. loss
E. reachability
F. administrative distance
Answer: C,D,E
Explanation:
Cisco PfR selects an egress or ingress WAN path based on parameters that affect application performance, including reachability, delay, cost, jitter, and Mean Opinion Score (MOS).
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/performance-routing-pfr/product_data_sheet0900aecd806c4ee4.html
Q428. Which statement about traffic management when PIM snooping is enabled is true?
A. Traffic is restricted to host ports.
B. All multicast traffic is flooded to the designated router.
C. Join message are flooded to all routers.
D. Designated routers receive traffic only from groups through which a join message is received.
Answer: D
Q429. Refer to the exhibit.
Which technology does the use of bi-directional BPDUs on all ports in the topology support?
A. RSTP
B. MST
C. Bridge Assurance
D. Loop Guard
E. Root Guard
F. UDLD
Answer: C
Explanation:
Spanning Tree Bridge Assurance
. Turns STP into a bidirectional protocol
. Ensures spanning tree fails “closed” rather than “open”
. If port type is “network” send BPDU regardless of state
. If network port stops receiving BPDU it’s put in BA-inconsistent state
Bridge Assurance (BA) can help protect against bridging loops where a port becomes designated because it has stopped receiving BPDUs. This is similar to the function of loop guard.
Reference: http://lostintransit.se/tag/convergence/
Q430. Into which two pieces of information does the LISP protocol split the device identity? (Choose two.)
A. Routing Locator
B. Endpoint Identifier
C. Resource Location
D. Enterprise Identifier
E. LISP ID
F. Device ID
Answer: A,B