Cisco 642-832 : Troubleshooting and Maintaining Cisco IP Switched Networks (TSHOOT)

642-832 real exams

Exam Code: 642-832

Exam Name: Troubleshooting and Maintaining Cisco IP Switched Networks (TSHOOT)

Updated: Sep 28, 2026

Q & A: 70 Questions and Answers

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Cisco 642-832 Exam Syllabus Topics:

SectionObjectives
Topic 1: Layer 2 Technologies- Spanning Tree Protocol (STP)
  • 1. STP root bridge issues
    • 2. Port states and convergence problems
      - VLANs and Trunking Troubleshooting
      • 1. VLAN membership and access port problems
        • 2. 802.1Q trunk configuration issues
          Topic 2: Infrastructure Services and Maintenance- IP Services Connectivity
          • 1. DHCP and DNS resolution problems
            - Device Management
            • 1. Remote access (SSH/Telnet) issues
              • 2. SNMP and Syslog troubleshooting
                Topic 3: IP Services- NAT and ACL Issues
                • 1. ACL blocking legitimate traffic
                  • 2. NAT overload configuration errors
                    - First Hop Redundancy Protocols
                    • 1. HSRP active/standby failures
                      Topic 4: Layer 3 Routing Technologies- EIGRP Troubleshooting
                      • 1. Neighbor relationships
                        • 2. DUAL algorithm and route selection issues
                          - OSPF Troubleshooting
                          • 1. Neighbor adjacency failures
                            • 2. Area mismatch and route propagation issues

                              Cisco Troubleshooting and Maintaining Cisco IP Switched Networks (TSHOOT) Sample Questions:

                              Question #1

                              Refer to the shown below. %PIX|ASA-3-105010: (Primary) Failover message block alloc failed * %PIX|ASA-3-106010: Deny inbound protocol src interface_name:dest_address/dest_port dst
                              interface_name:source_address/source_port * %PIX|ASA-3-106011: Deny inbound (No xlate) string * %PIX|ASA-3-106014: Deny inbound icmp src interface_name: IP_address dst interface_name:
                              IP_address (type dec, code dec) * %PIX-3-107003: RIP: Attempted reference of stale data encountered in function, line: line_num * %PIX|ASA-3-109010: Auth from inside_address/inside_port to outside_address/outside_port failed (too
                              many pending auths) on interface interface_name. * %PIX|ASA-3-109013: User must authenticate before using this service * %PIX|ASA-3-109016: Can't find authorization ACL acl_ID for user 'user' * %PIX|ASA-3-109018: Downloaded ACL acl_ID is empty * %PIX|ASA-3-109019: Downloaded ACL acl_ID has parsing error; ACE string * %PIX|ASA-3-109020: Downloaded ACL has config error; ACE * %PIX|ASA-3-109023: User from source_address/source_port to dest_address/dest_port on interface
                              outside_interface must authenticate before using this service. What statement is correct regarding the output shown in the graphic?

                              • A. These two log messages will not have a severity level. They are not errors but are just informational messages.
                              • B. These messages regarding interface status are normal output and will always be displayed when you exit config mode.
                              • C. The first log message is an error message with a severity level of 3.
                              • D. The second message would be shown if the logging console warning command had been issued.
                              • E. The first log message is categorized as a warning message.
                              Reveal Solution  Discussion  0

                              Correct Answer: C  πŸ—³οΈ

                              Question #2

                              Topic 6, Ticket 4 : BGP Neighbor
                              Topology Overview (Actual Troubleshooting lab design is for below network design)
                              Client Should have IP 10.2.1.3
                              EIGRP 100 is running between switch DSW1 & DSW2
                              OSPF (Process ID 1) is running between R1, R2, R3, R4
                              Network of OSPF is redistributed in EIGRP
                              BGP 65001 is configured on R1 with Webserver cloud AS 65002
                              HSRP is running between DSW1 & DSW2 Switches
                              The company has created the test bed shown in the layer 2 and layer 3 topology exhibits.
                              This network consists of four routers, two layer 3 switches and two layer 2 switches.
                              In the IPv4 layer 3 topology, R1, R2, R3, and R4 are running OSPF with an OSPF process number 1.
                              DSW1, DSW2 and R4 are running EIGRP with an AS of 10. Redistribution is enabled where necessary.
                              R1 is running a BGP AS with a number of 65001. This AS has an eBGP connection to AS 65002 in the
                              ISP's network. Because the company's address space is in the private range.
                              R1 is also providing NAT translations between the inside (10.1.0.0/16 & 10.2.0.0/16) networks and outside
                              (209.65.0.0/24) network.
                              ASW1 and ASW2 are layer 2 switches.
                              NTP is enabled on all devices with 209.65.200.226 serving as the master clock source.
                              The client workstations receive their IP address and default gateway via R4's DHCP server.
                              The default gateway address of 10.2.1.254 is the IP address of HSRP group 10 which is running on DSW1
                              and DSW2.
                              In the IPv6 layer 3 topology R1, R2, and R3 are running OSPFv3 with an OSPF process number 6.
                              DSW1, DSW2 and R4 are running RIPng process name RIP_ZONE.
                              The two IPv6 routing domains, OSPF 6 and RIPng are connected via GRE tunnel running over the
                              underlying IPv4 OSPF domain. Redistrution is enabled where necessary.
                              Recently the implementation group has been using the test bed to do a `proof-of-concept' on several
                              implementations. This involved changing the configuration on one or more of the devices. You will be
                              presented with a series of trouble tickets related to issues introduced during these configurations.
                              Note: Although trouble tickets have many similar fault indications, each ticket has its own issue and
                              solution.
                              Each ticket has 3 sub questions that need to be answered & topology remains same.
                              Question-1 Fault is found on which device,
                              Question-2 Fault condition is related to,
                              Question-3 What exact problem is seen & what needs to be done for solution


                              Client is unable to ping IP 209.65.200.241

                              Reveal Solution  Discussion  0

                              Correct Answer:

                              Solution Steps need to follow as below:
                              When we check on client 1 & Client 2 desktop we are not receiving DHCP address from R4 ipconfig ----Client will be receiving IP address 10.2.1.3
                              IP 10.2.1.3 will be able to ping from R4 , R3, R2, R1
                              Look for BGP Neighbourship Sh ip bgp summary ----- No O/P will be seen
                              Check for interface IP & ping IP 209.65.200.225 ---- Reply will be received from Webserver interface
                              Look for peering IP address via sh run on R1 interface serial 0/0/1
                              Since we are receiving icmp packets from Webserver interface on R1 so peering IP address under router BGP is configured wrong IP but with correct AS nos.
                              Change required: On R1 under router BGP Change neighbor 209.56.200.226 remote-as 65002 statement to neighbor 209.65.200.226 remote-as 65002

                              So in ticket Answer to the fault condition will be as below for

                              Question #3

                              Topic 13, Ticket 11 : IPV6 OSPF
                              Topology Overview (Actual Troubleshooting lab design is for below network design)
                              Client Should have IP 10.2.1.3
                              EIGRP 100 is running between switch DSW1 & DSW2
                              OSPF (Process ID 1) is running between R1, R2, R3, R4
                              Network of OSPF is redistributed in EIGRP
                              BGP 65001 is configured on R1 with Webserver cloud AS 65002
                              HSRP is running between DSW1 & DSW2 Switches The company has created the test bed shown in the layer 2 and layer 3 topology exhibits. This network consists of four routers, two layer 3 switches and two layer 2 switches. In the IPv4 layer 3 topology, R1, R2, R3, and R4 are running OSPF with an OSPF process
                              number 1.
                              DSW1, DSW2 and R4 are running EIGRP with an AS of 10. Redistribution is enabled where necessary.
                              R1 is running a BGP AS with a number of 65001. This AS has an eBGP connection to AS 65002 in the
                              ISP's network. Because the company's address space is in the private range.
                              R1 is also providing NAT translations between the inside (10.1.0.0/16 & 10.2.0.0/16) networks and outside
                              (209.65.0.0/24) network.
                              ASW1 and ASW2 are layer 2 switches.
                              NTP is enabled on all devices with 209.65.200.226 serving as the master clock source.
                              The client workstations receive their IP address and default gateway via R4's DHCP server.
                              The default gateway address of 10.2.1.254 is the IP address of HSRP group 10 which is running on DSW1
                              and DSW2.
                              In the IPv6 layer 3 topology R1, R2, and R3 are running OSPFv3 with an OSPF process number 6.
                              DSW1, DSW2 and R4 are running RIPng process name RIP_ZONE.
                              The two IPv6 routing domains, OSPF 6 and RIPng are connected via GRE tunnel running over the
                              underlying IPv4 OSPF domain. Redistrution is enabled where necessary.
                              Recently the implementation group has been using the test bed to do a `proof-of-concept' on several
                              implementations. This involved changing the configuration on one or more of the devices. You will be presented with a series of trouble tickets related to issues introduced during these configurations. Note: Although trouble tickets have many similar fault indications, each ticket has its own issue and
                              solution.
                              Each ticket has 3 sub questions that need to be answered & topology remains same.
                              Question-1 Fault is found on which device,
                              Question-2 Fault condition is related to,
                              Question-3 What exact problem is seen & what needs to be done for solution

                              Reveal Solution  Discussion  0

                              Correct Answer:

                              Solution Steps need to follow as below:
                              When we check on client 1 & Client 2 desktop we are not receiving DHCP address from R4 ipconfig ----Client will be receiving IP address 10.2.1.3
                              From Client PC we can ping 10.2.1.254....
                              But IP 10.2.1.3 is able to ping from R4, R3, R2, R1.
                              Since the problem is R1 (2026::111:1) is not able to ping loopback of DSW1 (2026::102:1).
                              Kindly check for neighbourship of routers as IPV6.... As per design below neighbourship should be present for IPV6 R1 ---R2 --- R3 --- R4--- DSW1 & DSW2 ----- Neighbourship between devices of IPV6

                              R2 IPV6 OSPF neighbourship is with R1

                              R3 IPV6 OSPF neighbourship is with R4

                              As per above snapshot we cannot see IPV6 neighbourship between R2 & R3 when checked interface configuration ipv6 ospf area 0 is missing on R2 which is connected to R3
                              Change required: On R2, IPV6 OSPF routing, Configuration is required ipv6 ospf 6 area 0 under interface serial 0/0/0.23
                              So in ticket Answer to the fault condition will be as below for

                              Question #4

                              Refer to the configuration statements shown in the graphic above. R1(config)#access-list 199 permit tcp host 10.1.1.1 host 172.16.1.1 R1(config)#access-list 199 permit tcp host 172.16.1.1 host 10.1.1.1 R1(config)#end R1#debug ip packet 199 detail Which statement reflects what the effect is of this configuration sequence?

                              • A. These commands turn on debug ip packet only for packets between hosts 10.1.1.1 and 172.16.1.1.
                              • B. These commands will only work when you specify only one host rather than two.
                              • C. These commands will generate an error message because you cannot use an access list with any debug commands.
                              • D. These commands will have no effect at all. The debug ip packet command will work as normal and display info for all IP packets.
                              Reveal Solution  Discussion  0

                              Correct Answer: A  πŸ—³οΈ

                              Question #5

                              Topic 10, Ticket 8 : Redistribution of EIGRP to OSPF
                              Topology Overview (Actual Troubleshooting lab design is for below network design)
                              Client Should have IP 10.2.1.3
                              EIGRP 100 is running between switch DSW1 & DSW2
                              OSPF (Process ID 1) is running between R1, R2, R3, R4
                              Network of OSPF is redistributed in EIGRP
                              BGP 65001 is configured on R1 with Webserver cloud AS 65002
                              HSRP is running between DSW1 & DSW2 Switches
                              The company has created the test bed shown in the layer 2 and layer 3 topology exhibits.
                              This network consists of four routers, two layer 3 switches and two layer 2 switches.
                              In the IPv4 layer 3 topology, R1, R2, R3, and R4 are running OSPF with an OSPF process number 1.
                              DSW1, DSW2 and R4 are running EIGRP with an AS of 10. Redistribution is enabled where necessary.
                              R1 is running a BGP AS with a number of 65001. This AS has an eBGP connection to AS 65002 in the
                              ISP's network. Because the company's address space is in the private range.
                              R1 is also providing NAT translations between the inside (10.1.0.0/16 & 10.2.0.0/16) networks and outside
                              (209.65.0.0/24) network.
                              ASW1 and ASW2 are layer 2 switches.
                              NTP is enabled on all devices with 209.65.200.226 serving as the master clock source.
                              The client workstations receive their IP address and default gateway via R4's DHCP server.
                              The default gateway address of 10.2.1.254 is the IP address of HSRP group 10 which is running on DSW1
                              and DSW2.
                              In the IPv6 layer 3 topology R1, R2, and R3 are running OSPFv3 with an OSPF process number 6.
                              DSW1, DSW2 and R4 are running RIPng process name RIP_ZONE.
                              The two IPv6 routing domains, OSPF 6 and RIPng are connected via GRE tunnel running over the
                              underlying IPv4 OSPF domain. Redistrution is enabled where necessary. Recently the implementation group has been using the test bed to do a `proof-of-concept' on several implementations. This involved changing the configuration on one or more of the devices. You will be
                              presented with a series of trouble tickets related to issues introduced during these configurations.
                              Note: Although trouble tickets have many similar fault indications, each ticket has its own issue and
                              solution.
                              Each ticket has 3 sub questions that need to be answered & topology remains same.
                              Question-1 Fault is found on which device,
                              Question-2 Fault condition is related to,
                              Question-3 What exact problem is seen & what needs to be done for solution


                              Client is unable to ping IP 209.65.200.241

                              Reveal Solution  Discussion  0

                              Correct Answer:

                              Solution Steps need to follow as below:
                              When we check on client 1 & Client 2 desktop we are not receiving DHCP address from R4 ipconfig ----Client will be receiving IP address 10.2.1.3
                              IP 10.2.1.3 will be able to ping from R4 , but cannot ping from R3, R2, R1
                              This clearly shows problem at R4 since EIGRP is between DSW1, DSW2 & R4 and OSPF protocol is running between R4, R3, R2, R1 so routes from R4 are not propagated to R3, R2, R1
                              Since R4 is able to ping 10.2.1.3 it means that routes are received in EIGRP & same needs to be advertised in OSPF to ping from R3, R2, R1.
                              Need to check the routes are being advertised properly or not in OSPF & EIGRP vice-versa.
                              From above snap shot it clearly indicates that redistribution done in EIGRP is having problem & by default all routes are denied from ospf to EIGRP... so need to change route-map name.
                              Change required: On R4, in redistribution of EIGRP routing protocol, we need to change name of route-map to resolve the issue...


                              So in ticket Answer to the fault condition will be as below for

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