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2013 Latest Cisco 350-001 Exam Section 6: The Use of ‘Show’ and ‘Debug’ Commands (3 Questions)

QUESTION NO: 1 To display the routing table of router TK1, the “show ip route” command was issued. Router TK1 is running OSPF. Which one of the following statements is correct regarding the OSPF information in a routing table?
A. A routing designated with only an “O” represents either a type-1 or type-2 LSA.
B. A route that has been redistributed into OSPF can only be represented with either an “E1” or “E2” designation.
C. Routes that are within an area (intra-area) are marked with an “IA” in the routing table.
D. Type-7 LSAs display routes redistributed into OSPF from another process, and thus are shown with either an “E1” or “E2” marking.
E. All LSA types have unique designations in the IP routing table.
Answer: B
Explanation:
The following OSPF codes are used in the IP routing tables of OSPF routers: O – OSPF IA – OSPF inter area N1 – OSPF NSSA external type 1 N2 – OSPF NSSA external type 2 E1 – OSPF external type 1 E2 – OSPF external type 2 When redistributing routes into OSPF, the routes are considered to be learned from an external means, so they will always display as external type 1 or external type 2 routes. These routes will appear as E1 or E2 in the routing table.
Incorrect Answers:
A. A route designated with an “O” only represents a generic OSPF learned route.
C. Routes displayed as “IA” are inter-area, not intra-area.
D. Type 7 routes are displayed as normal OSPF routes.
E. The designations in the routing table are not based on LSA types. They are based only on the type of OSPF route.

QUESTION NO: 2 While troubleshooting an issue with a serial interface on the testking4 router, you issue the “show interface” command as shown below: Based on the information above, how many times has the interface been reset by the telco service provider?
A. 0
B. 1
C. 3
D. 4
E. 1023
F. None of the above
Answer: C
Explanation:
Carrier transitions appear in the output of the show interfaces serial exec command whenever there is an interruption in the carrier signal (such as an interface reset at the remote end of a link).
Incorrect Answers:
B. The output shows 1 interface reset, but Interface resets that appear in the output of the “show interfaces serial” exec command are the result of missed keepalive packets, and are not indicative of resets sent by the service provider. Reference: “Troubleshooting Serial Lines” http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1915.htm#xtocid7

QUESTION NO: 3 The show ip bgp regexp [regexp] command is most useful when performing which type of BGP troubleshooting?
A. To verify and troubleshoot BGP Prefix-list filtering configurations.
B. To verify and troubleshoot BGP AS-Path filtering configurations.
C. To verify and troubleshoot BGP route-maps configurations.
D. To verify and troubleshoot BGP synchronization problems.
E. To verify and troubleshoot BGP AS-path prepending configurations.
Answer: B
Explanation:
A regular expression is a pattern to match against an input string. You specify the pattern that a string must match when you compose a regular expression. Matching a string to the specified pattern is called “pattern matching.” Pattern matching either succeeds or fails. You can use regular expressions in the ip as-path access-list command with Border Gateway Protocol (BGP) to filter AS path information. To display routes matching the autonomous system path regular expression, use the “show ip bgp regexp” command in EXEC mode.
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