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What you need to know about DNS

DNS (Domain Name System) is an essential system of Internet infrastructure that translates human-readable domain names (like www.example.com) into computer-understandable IP addresses (like 192.0.2.1). This conversion allows users to easily access websites and online services without having to memorize complex IP addresses. DNS functions as a decentralized global directory, organized in a hierarchy of servers. When a user enters a domain name in a browser, a DNS query is sent to look up the associated IP address. DNS servers resolve these queries by interrogating different levels, from root servers to authoritative name servers. DNS is also used for other network services, such as emails, through MX records, or to secure connections via DNSSEC records. It is a crucial component for Internet browsing, ensuring resource accessibility while maintaining high performance and reliable domain name management.

Your search returns 28 results.
Contractor
Permanent

Job VacancyChef de Projet Réseau – Intégration de filiales sur Saint Quentin en Yvelines

EterniTech
Published on
Cisco
DNS
Fortinet

3 months
Yvelines, France
Contexte de la mission Dans le cadre de projets de transformation IT et d'opérations de croissance externe, nous recherchons un Chef de Projet Réseau / Infrastructure confirmé pour piloter l'intégration de nouvelles filiales au sein du système d'information du groupe. Le consultant interviendra sur des projets d'intégration d'infrastructures réseau et télécoms, en garantissant le respect des engagements en termes de coûts, délais, qualité et sécurité. Missions principales Piloter les projets d'intégration de nouvelles filiales sur les périmètres réseau, télécom et infrastructure IT. Assurer le cadrage des projets : périmètre, planning, budget, ressources et gouvernance. Coordonner les différentes équipes techniques : Réseau, Sécurité, Systèmes, Télécoms ainsi que les prestataires externes. Organiser et animer les instances projet (comités projet, COPIL, points de suivi). Suivre les risques, les dépendances, les alertes et les plans d'actions associés. Garantir l'intégration des infrastructures filiales dans le SI groupe. Piloter les phases de migration, de bascule et de mise en production. Assurer le reporting auprès des parties prenantes et du management. Compétences techniques recherchéesInfrastructure Réseau & Télécom LAN / WAN SD-WAN VPN Site-to-Site Wi-Fi entreprise Architecture réseau d'entreprise Firewall / sécurité réseau DNS / DHCP Connectivité inter-sites Gestion de projet Infrastructure Pilotage de projets techniques complexes Cadrage projet, planning, budget, ressources Gestion des risques et dépendances Coordination d'équipes techniques multidisciplinaires Gestion de fournisseurs et partenaires Expérience attendue Expérience significative en gestion de projets d'infrastructure réseau. Expérience sur des projets d'intégration de filiales, fusion-acquisition (M&A), migration ou transformation SI. Bonne compréhension des enjeux de sécurité réseau et d'interconnexion multi-sites.
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Premium Job
Permanent

Job VacancyIT Support Analyst/Engineer with Level 1 and Level 2

Nexus Jobs Limited
Published on
Cisco
DHCP (Dynamic Host Configuration Protocol)
DNS

£55k-60k
SW1V 1SW, London, England, United Kingdom
IT Support Analyst/Engineer with Level 1 and Level 2 Role Description This full-time IT Support Analyst/Engineer role covers both Level 1 and Level 2 support and is offered on a hybrid basis, with work primarily in London and some work from home flexibility. Day-to-day responsibilities include handling incoming support tickets, responding to user queries, and providing first-line technical assistance for hardware, software, and network issues. The role also involves performing more advanced second-line diagnostics, resolving complex incidents, escalating problems when required, and updating documentation and knowledge bases. The IT Support Analyst/Engineer will install and configure systems, manage user accounts and access permissions, monitor system performance, and assist with routine maintenance tasks and upgrades. Collaboration with other IT team members and clear communication with non-technical users are key aspects of the position. Qualifications · Candidates should possess strong Technical Support and Information Technology skills, including experience with common operating systems, hardware, and business applications. · Candidates should possess solid Analytical Skills and Troubleshooting abilities to diagnose issues, identify root causes, and deliver effective solutions. · Candidates should possess clear and professional Communication skills, with the ability to explain technical concepts to users at different levels of technical understanding. · Relevant certifications such as CompTIA A+, Network+, Microsoft, or similar credentials are beneficial, along with experience in Level 1 and Level 2 support environments. · Ability to work in a hybrid setting, manage priorities in a busy service desk environment, and maintain a customer-focused, inclusive approach when supporting diverse user groups. For this position you will have at least 5 years experience in IT as an IT Support Engineer with 1st and 2nd Level support experience - ideally in the Banking/Financial industry. In-depth knowledge of and troubleshooting experience with Windows, Office applications and conferencing applications. Responsible for the support and maintenance of the IT infrastructure and to provide IT support to staff and other group colleagues. To assist in the response to service outages and other IT related problems as well as maintenance and upkeep of for security of the systems in place. · To provide IT Support and assistance to the branch's staff in a timely manner. · Responsible for the maintenance of the IT infrastructure of the Branch by providing first & Second line support of software, hardware and networking that includes installation, configuration and troubleshooting. Support endpoint security standards (antivirus/firewall/patching/two-factor authentication). · Provide day to day support to the Admin and HR function to cover: joiners/leavers/movers process, CCTV & Paxton Card Access. · Assist the IT Manager in delivering various IT related projects by managing the day to day operational aspects of such projects. · End User Computing support for all staff. (eg Install, configure, and maintain desktops, laptops, printers, Phones/Mobiles and other IT equipment.) · Networking Fundamentals – DNS, DHCP, TCP/IP, and LAN/WAN. · Good understanding of cybersecurity measures · Coordinator between the London Users and Group IT Security on all requests for systems access and to ensure that such permissions are provided promptly, are regularly updated and that the Group Access Matrix Protocol is followed at all times. · Preserve the Assets of the Office by implementing Disaster Recovery and back up procedures and ensuring that the standards comply with Group requirements. · Provide IT support to ensure the smooth running of daily and periodic reports for the London Compliance team to ensure adherence to the Anti Money Laundering Provisions. · Undertake Data Extraction for reporting requirements for all the other stakeholders at the branch. · To hold Administrator function for some of the systems housed at the Office. Responsible for the granting of access and maintenance of system matrixOverall networking equipment monitoring (ie Network Switches, Firewall and other appliances) and support inclusive of the server room. · To plan and carry out maintenance checks to ensure IT Operations, infrastructures are running smoothly and ensure daily routine task completeness. · Manage inventory of computers, network equipment including tracking of purchased equipment and services. · To maintain and ensure that the BCP site is always ready for continuous bank operations · Important Business Services - IBS owner is to ensure the resilience of the IBS they are responsible for (Ensure appropriate RCSAs, CETs, KRIs are in place to monitor procedures and controls within their units) · Assist the HOD/Manager with implementing/putting in place, any applicable training/guidance/SOPs to staff relating to cyber security & operational resilience. · To maintain the branch Avaya IP Office Phone system and to ensure that the recording system is always up and running at all times. · To perform monthly infrastructure test and report for Risk Assessment. · Manage Incident Handling procedure (This includes monitoring as well as post-incident follow up). · Respond to IT service requests and incidents in a timely manner, prioritizing based on business impact, especially for critical banking functionsSupport the Branch operations as and when needed and any other tasks assigned by Management of the Branch. Data Integrity and Compliance Operationalize data strategy and communicate to the Data Owner or the Management any changes in their BAU requirements which involve data. · To ensure all data worked on and or/shared with internal/external clients are accurate, compliant and maintained in accordance with Company's data quality standards. · Handle all data in strict alignment with the General data protection Regulations (GDPR) principles. · Keep track of documents created by the team. · Escalate any suspected data breaches or privacy issues to the DPO promptly and without delays. · Ensuring any data sharing requests are discussed with HOD/DPO so that prior authorization is given and follows GDPR / department's SOPs. · Collaborate with DPO on data Protection Impact Assessment when introducing new systems or processes to ensure privacy risks are mitigated at the outset. Technical Skills Required - Proficient in common operating systems (Windows 11 and Linux, Server 2016 and later) - Providing AV support for branches - Software proficiency – O365, Onedrive, Teams, Sharepoint, Bloomberg, FXT, SEP, SEE, ME Endpoint Protection, Murex, Swift, 1AML, SIBS, GFMS, COP, Refinitiv, Syncovery, SQL Server, Paxton, VBR, VRO and VeeamOne - Proficient in Imaging windows machines, image creation & management, GPO, and AD - Networking Fundamentals – DNS, DHCP, TCP/IP, and LAN/WAN. - Good understanding of Vmware; ESXI, vSphere, vCenter, Fortigate Firewalls, Cisco Switches - Good understanding of patching practices and troubleshooting - Install, configure, and maintain desktops, laptops, printers, Phones/Mobiles and other IT equipment. - AV support (conference phones, Logitech meeting room solutions etc.) - Proficient in programming languages - Project management - Data analysis and reporting Bachelor or Master's degree or professional qualification in relevant discipline (IT/Information Systems/Computer Science/Technology/Programming/Information Science/System Engineering/Computing) This is a 5 days in the office role in Central London. Salary for this role will be around £55K - £60K. Do send your CV to us in Word format along with your salary and availability.
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Premium Job
Permanent

Job VacancyNetwork Team Lead Operations

KOLABS Group
Published on
Aruba
Cisco
Cisco Meraki

60k-85k €
Paris, France
Nous recherchons pour le compte de notre client - acteur du secteur du luxe - un responsable d'équipe réseau en afin de gérer la criticité et la complexité croissantes des services de télécommunications et des infrastructures partagées. La mission s'inscrit au sein de la DSI Holding et est rattachée au responsable IT Operations. Elle couvre l'ensemble des réseaux LAN, WAN, Internet ainsi que la sécurité opérationnelle des sites de la Holding et des entités rattachées. Le poste inclut également le support réseau des applications diffusées auprès des différentes entités du groupe. Le poste est à pourvoir exclusivement en CDI au sein de notre ESN. 🎯 Principales missions : - Superviser les activités RUN (incidents, problèmes, changements, configurations) - Manager une équipe réseau (2 à 4 experts) et piloter les priorités - Assurer la coordination avec les équipes Architecture, infogérants et partenaires - Piloter les projets réseau (déploiement, migration, coordination technique) - Garantir la qualité de service et l'expérience utilisateur - Mettre en place et améliorer les processus ITIL (incident, change, problem) - Contribuer aux choix techniques et à l'évolution des architectures réseau - Assurer la gestion des risques, des capacités et des configurations 🌐 Environnement technique : LAN / WAN / WIFI / 5G / Internet Sécurité réseau (Firewall, IPS, Proxy…)
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Permanent

Job VacancyAdministrateur système et réseaux H/F

Les Filles et les Garçons de la Tech
Published on
Active Directory
Aruba
Cisco

40k-51k €
Lavaur, Occitania
Dans le cadre du renforcement de ses équipes informatiques, le client (secteur santé) recherche un Administrateur Systèmes & Réseaux polyvalent pour intervenir sur site. La mission consiste à assurer l'exploitation, l'administration, le maintien en conditions opérationnelles et l'évolution des infrastructures IT. Le consultant travaillera au cœur du système d'information et participera aux activités de support de niveau avancé, d'administration, de sécurisation et d'optimisation des plateformes techniques. Missions : Administrer et maintenir les infrastructures réseaux Cisco et Aruba. Superviser les équipements réseau, la connectivité et les performances. Assurer la gestion des VLAN, routage, commutation, Wi-Fi et règles d'accès. Administrer les plateformes de virtualisation VMware et Proxmox. Déployer, maintenir et optimiser les machines virtuelles. Administrer les serveurs Microsoft Windows. Gérer Active Directory, DNS, DHCP, GPO et services associés. Participer aux activités de sauvegarde, restauration et continuité de service. Diagnostiquer et résoudre les incidents de niveau 2/3. Produire la documentation technique et mettre à jour les procédures. Participer aux projets d'évolution d'infrastructure et de modernisation. Garantir l'application des bonnes pratiques de sécurité informatique. Assurer le support technique auprès des équipes locales. Environnement technique : Réseau : Cisco, Aruba, switching, VLAN, Wi-Fi, routage, supervision. Virtualisation : VMware vSphere, Proxmox. Systèmes : Windows Server 2016/2019/2022. Services Microsoft : Active Directory, DNS, DHCP, GPO, fichiers et impressions. Sauvegarde et PRA/PCA. Outils de supervision et d'administration. Environnements de production critiques à forte disponibilité Livrables et objectifs de la mission : Maintien d'un haut niveau de disponibilité des infrastructures, réduction des incidents récurrents, documentation à jour, participation aux projets et amélioration continue des performances du SI.
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Permanent

Job VacancyDevOps Senior Operations Engineer

Nexus Jobs Limited
Published on

£60k-80k
Bristol, England, United Kingdom
DevOps Senior Operations Engineer Our Client is looking to recruit a Senior DevOps Engineer with at least 5 to 7 years expertise. They are a young talented team building the next generation video advertising platform. The key purpose of this role is focused on development in the capacity of improvements to the systems and operational environment by scripting, automation or building of tools. There are several key areas that require constant development: • Automation – Enhancements to the automation build process. Enhancements are continuously added to the base repository as well as additions of new technologies. • Scripting and Tools – There are many processes, tasks that can be made easier using scripts or custom designed tools in a managed services environment. We are looking for someone with knowledge of networking and storage, virtualization and operating systems, as well as good knowledge of the Architecture side of the role. Ideal skills and experience - what are you bringing to the party? • Experience working in operations - making sure the wheels are greased and the ship is humming along • Automation, Packaging, Deployments (Custom Hypervisor, Puppet, Git, scripting, CI services) • Source Code version control systems: Git & SVN • Monitoring: NewRelic, PagerDuty, etc • Programming Languages: Bash, PHP, GoLang • Virtualisation: We have a custom hypervisor (ZPF) but things like VMWare ESXi/KVM/oVirt/RHEV • Classics: Apache, MySQL, Redis, Varnish • Logstash & Elasticsearch • Networking (switching, routing, firewalls, IDS/IPS, VPN, load balancing, DNS, Cisco, F5, Akamai) • Multi cloud setup - AWS, Digital Ocean, Rackspace, Linode etc • DNS, NTP, SMTP, Jenkins • A solid background in Linux System Administration Functions and responsibilities This is a dynamic and varied role, which includes things like: • Build, deployment and maintenance of new and existing environments • Designing and maintaining highly available architectures • Security (patch management, vulnerability scanning & monitoring) • Uptime – design and maintain the systems and networking for uptime, resilience, architecting for failure. • Evaluation of new, cutting-edge technologies to help improve business processes and streamline • Develop highly-available, scalable, robust systems and take ownership of problems as they occur • Undertake ad-hoc out of business hours work for occasional technical support The salary for this role will be in the range £60K - £80K. Please send your CV to us in Word format.
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Permanent

Job VacancyIT Support Engineer

Nexus Jobs Limited
Published on

£45k-55k
London, England, United Kingdom
IT Support Engineer Our Client is an established bank based in Central London. They are looking to recruit an IT Support Analyst with at least 5 plus years hands-on expertise of working within IT Support and Infrastructure. The following are list of skills required for the position: · Microsoft Windows (all versions) experience to a high level (troubleshoot and effectively resolve issues by research/using knowledge bases in a confident way). · Active Directory to a high level - security groups, administration/deployment, LDAP, ADSI. · Citrix XenApps – Administration, Maintenance and Support of existing Citrix XenApps server farm · Windows Server Environment 2012/2016 - design, deployment, maintenance and support. · VM-Ware virtualisation environments. · Backups (various and ability to use different applications). · Networking - design/troubleshoot/installation (VLAN, routing, switching, TCP/IP and OSI) · Router maintenance - wireless configuration, installation and setups. · PowerShell to a competent level (backup/azure/EMC). · VPN Administration and Deployment. · DNS – administration of DNS internal and external. The salary for this position with be circa £45K - £55K. This is a hybrid position and you will be required to be in the office at least 3 days a week. The position will be a 12 month full time contract – FTC initially. Do send your CV to us in Word format along with your salary and availability.
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Permanent

Job VacancyIT Support Engineer

Nexus Jobs Limited
Published on

£40k-50k
London, England, United Kingdom
IT Support Engineer Our Client is an established bank based in Central London. They are looking to recruit an IT Support Analyst with at least 5 plus years of 1 and 2 level hands-on expertise of working within IT Support and Infrastructure from a banking environment. The following are list of skills required for the position: · Microsoft Windows (all versions) experience to a high level (troubleshoot and effectively resolve issues by research/using knowledge bases in a confident way). · Active Directory to a high level - security groups, administration/deployment, LDAP, ADSI. · Citrix XenApps – Administration, Maintenance and Support of existing Citrix XenApps server farm · Windows Server Environment 2012/2016 - design, deployment, maintenance and support. · VM-Ware virtualisation environments. · Backups (various and ability to use different applications). · Networking - design/troubleshoot/installation (VLAN, routing, switching, TCP/IP and OSI) · Router maintenance - wireless configuration, installation and setups. · PowerShell to a competent level (backup/azure/EMC). · VPN Administration and Deployment. · DNS – administration of DNS internal and external. Experience of supporting Market Data and Bloomberg would be a great plus. The salary for this position with be circa £40K - £50K. This is a hybrid position and you will be required to be in the office at least 3 days a week. The position will be a 12 month full time contract – FTC initially. Do send your CV to us in Word format along with your salary and availability.
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Contractor
Permanent

Job VacancyConsultant(e) Coordination & Gestion des Plateformes de Test Billettique

Hexagone Digitale
Published on
Active Directory
Apache
AWS Cloud

1 year
25k-35k €
300-350 €
Paris, France
Notre client, acteur majeur du secteur du transport en Île-de-France, recherche un consultant pour renforcer son équipe en charge des moyens de test, dans le cadre d'une mission d'un an. Le contexte est particulier : un déménagement de locaux est prévu fin 2026 / début 2027, ce qui implique un accompagnement de la transition en parallèle de l'activité courante. La mission porte sur la gestion et la coordination de deux plateformes de test physiques : une plateforme partagée avec un partenaire institutionnel du secteur (équipements billettiques : valideurs, automates de distribution, postes de travail, cartes de transport, téléphones mobiles) et une plateforme interne (principalement des postes d'agence pour l'encodage et l'impression de titres de transport). Le rôle n'est pas un rôle d'exploitation technique directe : le consultant assure le relais entre les équipes opérationnelles internes et externes, et les équipes techniques (opérateurs de transport, industriels de la billettique). Il gère la configuration des équipements selon les campagnes de test demandées, réserve et prépare le matériel pour les testeurs, tient l'inventaire des équipements (notamment la flotte de téléphones mobiles) et fait remonter les besoins et problématiques via des outils de ticketing et de documentation collaborative. Une habilitation électrique sera dispensée par le client (nécessaire pour couper l'alimentation générale en cas d'incident). Le consultant accompagnera également la transition vers le nouveau site, avec une présence prioritaire sur le site actuel dans un premier temps.
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System administrator

The Systems Administrator manages and configures DNS servers to ensure correct domain name resolution and service availability.

Systems & Networks Engineer

The Systems & Network Engineer administers and optimizes DNS services in a complex network environment, managing DNS zones, security, and redundancy.

Systems and Networks Manager

The Systems and Network Manager supervises the management of the company’s DNS infrastructure, implementing security and performance strategies for domain name services.

Network Technician

The Network Technician installs and maintains DNS configurations in company networks, ensuring connectivity and rapid domain name resolution.

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