Exambible offers free demo for 400 101 vce exam. "CCIE Routing and Switching (v5.0)", also known as 400 101 pdf exam, is a Cisco Certification. This set of posts, Passing the Cisco 400 101 vce exam, will help you answer those questions. The ccie 400 101 dumps Questions & Answers covers all the knowledge points of the real exam. 100% real Cisco cisco 400 101 exams and revised by experts!

Q291. Refer to the exhibit. 

A Cisco Catalyst 6500 Series Switch experiences high CPU utilization. What can be the cause of this issue, and how can it be prevented? 

A. The hardware routing table is full. Redistribute from BGP into IGP. 

B. The software routing table is full. Redistribute from BGP into IGP. 

C. The hardware routing table is full. Reduce the number of routes in the routing table. 

D. The software routing table is full. Reduce the number of routes in the routing table. 

Answer:

Explanation: 

FIB TCAM Exception - If you try to install more routes than are possible into the FIB TCAM you will see the following error message in the logs: 

CFIB-SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched 

%CFIB-SP-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched. 

%CFIB-SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched. 

This error message is received when the amount of available space in the TCAM is exceeded. This results in high CPU. This is a FIB TCAM limitation. Once TCAM is full, a flag will be set and FIB TCAM exception is received. This stops from adding new routes to the TCAM. Therefore, everything will be software switched. The removal of routes does not help resume hardware switching. Once the TCAM enters the exception state, the system must be reloaded to get out of that state. You can view if you have hit a FIB TCAM exception with the following command: 

6500-2#sh mls cef exception status 

Current IPv4 FIB exception state = TRUE 

Current IPv6 FIB exception state = FALSE 

Current MPLS FIB exception state = FALSE 

When the exception state is TRUE, the FIB TCAM has hit an exception. 

The maximum routes that can be installed in TCAM is increased by the mls cef maximum-routes command. 

Reference: https://supportforums.cisco.com/document/59926/troubleshooting-high-cpu-6500-sup720 


Q292. Refer to the exhibit. 

Which option is the result of this configuration? 

A. All SNMP traffic coming into the router is redirected to interface GigabitEthernet1/0. 

B. All SNMP traffic generated from the router is redirected to interface GigabitEthernet1/0. 

C. All SMTP traffic generated from the router is redirected to interface GigabitEthernet1/0. 

D. All POP3 traffic coming into the router is redirected to interface GigabitEthernet1/0. 

E. All SMTP traffic coming into the router is redirected to interface GigabitEthernet1/0. 

Answer:

Explanation: 

This is an example of policy based routing, where traffic sourced from this router that matches the access list (all traffic with port 25 which is SMTP) will be forced out the Gig 0/1 interface. 


Q293. Which three options are results of the command no mpls ip propagate-ttl? (Choose three.) 

A. It prevents the TTL from being copied from the IP header to the MPLS header. 

B. It prevents the MPLS hops from being visible to a CE router when you perform a traceroute. 

C. A fixed TTL value of 255 is used for the first label of the IP packet. 

D. It prevents the TTL from being copied from the MPLS header back into the IP header. 

E. MPLS hops remain visible on a CE router when you perform a traceroute. 

F. A fixed TTL value of 1 is used for the first label of the IP packet. 

Answer: A,B,C 


Q294. A network engineer wants to add a new switch to an existing switch stack. Which configuration must be added to the new switch before it can be added to the switch stack? 

A. No configuration must be added. 

B. stack ID 

C. IP address 

D. VLAN information 

E. VTP information 

Answer:


Q295. Which two discovery mechanism does LDP support? (Choose two.) 

A. strict 

B. extended 

C. loose 

D. targeted 

E. basic 

Answer: B,E 


Q296. Refer to the exhibit. 

All of the routers on this network are running RIP. If you edit the R3 RIP process configuration to reduce the number of hops from R3 to R1, which statement about the configuration change is true? 

A. Configuring no passive-interface for GigabitEthernet0/0 in the R3 RIP process reduces the number of hops to R1 by 2. 

B. Configuring no passive-interface for GigabitEthernet0/0 in the R3 RIP process reduces the number of hops to R1 by 1. 

C. Configuring no passive-interface for GigabitEthernet0/1 in the R3 RIP process reduces the number of hops to R1 by 3. 

D. Configuring no passive-interface for GigabitEthernet0/1 in the R3 RIP process reduces the number of hops to R1 by 1. 

Answer:

Explanation: 

By changing the link from R3 to R2 to not be passive, traffic can then take the direct route from R3-R2-R1 instead of the longer path of R3-R6-R5-R4-R1, resulting in two less hops. 


Q297. Refer to the exhibit. 

If OSPF is implemented on the network, which additional configuration is needed to allow traffic from host 10.4.1.15/24 to host 10.1.2.20/24? 

A. A virtual link between router 2 and router 4 

B. A virtual link between router 3 and router 4 

C. A virtual link between router 2 and router 3 

D. The current design allows traffic between the two hosts. 

Answer:

Explanation: 

This specific traffic from 10.4.1.0/24 to 10.1.2.0/24 would work because this traffic crosses only over the single OSPF area of 0.0.0.1. 

However, traffic from hosts on R4 to R1 would indeed need a virtual link, since area 0.0.0.2 is not connected to the backbone area of 0.0.0.0. 


Q298. Which two statements are true about IS-IS? (Choose two.) 

A. IS-IS DIS election is nondeterministic. 

B. IS-IS SPF calculation is performed in three phases. 

C. IS-IS works over the data link layer, which does not provide for fragmentation and reassembly. 

D. IS-IS can never be routed beyond the immediate next hop. 

Answer: C,D 

Explanation: 

IS-IS runs directly over the data link alongside IP. On Ethernet, IS-IS packets are always 802.3 frames, with LSAPs 0xFEFE while IP packets are either Ethernet II frames or SNAP frames identified with the protocol number 0x800. OSPF runs over IP as protocol number 89. 

IS-IS runs directly over layer 2 and hence: 

-cannot support virtual links unless some explicit tunneling is implemented 

-packets are kept small so that they don't require hop-by-hop fragmentation 

-uses ATM/SNAP encapsulation on ATM but there are hacks to make it use VcMux encapsulation 

-some operating systems that support IP networking have been implemented to differentiate Layer 3 packets in kernel. Such Oss require a lot of kernel modifications to support IS-IS for IP routing. 

-can never be routed beyond the immediate next hop and hence shielded from IP spoofing and similar Denial of Service attacks. 

Reference: https://tools.ietf.org/html/draft-bhatia-manral-diff-isis-ospf-00 


Q299. Refer to the exhibit. 

Which two are causes of output queue drops on FastEthernet0/0? (Choose two.) 

A. an oversubscribed input service policy on FastEthernet0/0 

B. a duplex mismatch on FastEthernet0/0 

C. a bad cable connected to FastEthernet0/0 

D. an oversubscribed output service policy on FastEthernet0/0 

E. The router trying to send more than 100 Mb/s out of FastEthernet0/0 

Answer: D,E 

Explanation: 

Output drops are caused by a congested interface. For example, the traffic rate on the outgoing interface cannot accept all packets that should be sent out, or a service policy is applied that is oversubscribed. The ultimate solution to resolve the problem is to increase the line speed. However, there are ways to prevent, decrease, or control output drops when you do not want to increase the line speed. You can prevent output drops only if output drops are a consequence of short bursts of data. If output drops are caused by a constant high-rate flow, you cannot prevent the drops. However, you can control them. 

Reference: http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/6343-queue-drops.html 


Q300. Which two statements about OSPF are true? (Choose two.) 

A. External type 2 routes are preferred over interarea routes. 

B. Intra-area routes are preferred over interarea routes. 

C. External type 1 routes are preferred over external type 2 routes. 

D. External type 1 routes are preferred over intra-area routes. 

E. External type 2 routes are preferred over external type 1 routes. 

Answer: B,C